A shot at some dynasty RB rankings for PPR leagues:
1. LeSean McCoy, PHI - The safe compromise between security and youth. Then again, that was Ray Rice two years ago and look at him now. McCoy is the obvious choice if you're looking at it from a three year window type of perspective, but others may offer more for teams with a longview.
2. Doug Martin, TB - I believe in his talent and he's right in the prime of his career. The Mike James factor may scare some teams away. I see Martin as a superior all-around player and a good bet to remain a FF RB1 for the next few years regardless.
3. Gio Bernard, CIN - He's the one current starter from this rookie RB class that I have total faith in. Very good player and his versatility is a huge plus. Given his age, you can argue that he's going to hold his value better than the two guys ranked above him here.
4. Jamaal Charles, KC - Much like McCoy, his value is pretty immediate. You're going to get 2-3 really good seasons and then probably not much else.
5. Trent Richardson, IND - It might be madness to rank him this high, but I think his current struggles have a lot to do with circumstance. He's still young and has the skill set to be a rock in FF lineups for the next half decade. If he's a bust, I'm content to go down with the ship.
6. Adrian Peterson, MIN - A short-term dynamo with big difference-maker potential for the next 1-2 years. For a contender, he has more value than any of these younger players besides maybe Bernard. For a rebuilder I might rather have Michael.
7. CJ Spiller, BUF - A mystifying player who obviously has a lot of talent, but can't seem to get the consistent touches he needs. He turns 27 in August and his game is predicated totally on speed.
8. Alfred Morris, WAS - He is what he is. An awesome runner who adds ZERO value as a receiver. There's minimal upside, but you know what you're getting.
9. Eddie Lacy, GB - I like, but don't love his talent. On raw ability alone I don't rate him as a top 10 NFL RB (probably not even that close). This ranking is mainly about situation. He appears to have the Green Bay RB job on lockdown and it's tough to envision them drafting a replacement within the next couple years.
10. Reggie Bush, DET - Not all that different from Peterson and Charles in terms of outlook. What you're getting is a brief window of dynamic ppg numbers.
11. Arian Foster, HOU - There are some signs that he might be breaking down a little bit. On the other hand, he's a complete back who provides great FF numbers when healthy. He should continue as the unquestioned starter in Houston next year with Tate likely gone.
12. Matt Forte, CHI - Yet another aging star who should have 1-2 very good years left.
13. Christine Michael, SEA - An ascending asset whose value will really blossom once he becomes the starter. For a rebuilding team, I might take him as high as RB6-7. There's no doubt that his value will go up in the near future. He also appears to have legit talent. The only major question is whether he can be a durable player long term. That was the main problem for him in college and it will probably be the determinant of whether he becomes a mega star or merely a tease.
14. Stevan Ridley, NE - Not all that different from Morris in my view. Just not quite as effective and faces more competition for work. He's a boring FF RB2 without the upside to ever become much more than that.
15. DeMarco Murray, DAL - When he's healthy, he's an explosive and versatile starter. He's almost guaranteed to miss time every season though.
16. Bernard Pierce, BAL - I think he has starter talent, so the lack of opportunity should eventually correct itself. The major issue is durability. Pierce is often nicked up and may end up being a DeMarco Murray type once he finally gets his chance.
17. Jonathan Stewart, CAR - More talented than anyone ranked outside the top 13 (and some ranked inside the top 10). It's just a question of staying healthy and getting the necessary touches.
18. Ben Tate, HOU - The main attraction here is the opportunity to sign somewhere as a starter in the offseason. I don't think he's some kind of awesome player, but he's good enough to be a decent producer if given carries.
19. Zac Stacy, STL - I wouldn't draft him at his ADP at a startup and I would not be the least bit surprised to see him fade into irrelevance. However, he's a young starter who MAYBE has enough talent to last. This is an opportunity ranking.
20. LeVeon Bell, PIT - Much like Stacy except his production has been a lot worse this year. He has been positively ploderrific for the Steelers and that's consistent with my impression of him from college. I think he's a huge risk to fade into the abyss, but there's always a chance that I'm wrong and the upside is decent.
21. Ray Rice, BAL - Value has taken a massive hit this year. Is he struggling because of Baltimore's offense or is he declining? Might be a bit of both. The fact that he's no longer young and you can no longer rely on him for standout production makes him a dicey FF proposition. There's some potential that he turns into a Frank Gore-like steal for the next few years based on all the age-related paranoia and downgrading that he'll suffer from.
22. Knowshon Moreno, DEN - A pedestrian runner who does a lot of the little things (pass blocking and catching) well. He's the new Joseph Addai. Will he hold off Montee Ball indefinitely? Will he stay in Denver? Will he implode once Manning is gone? There is all sorts of long term risk here, but the immediate value is obvious too.
23. Ryan Mathews, SD - He finally looks good again, but his limited usage is killing his FF value. Given that he's basically unstartable and there's no immediate route to workhorse duties with Woodhead in the fold, he's really not much more than a bye week fill-in or best ball special at the moment.
24. Mark Ingram, NO - Maybe this is an overreaction to last night's game, but he looked good. He's still young enough to turn his career around if he can land in a situation where he'll be utilized correctly. I see a Benson/Moreno type of ceiling here and that might be worth a punt if you can get him cheap.
25. Bryce Brown, PHI - Shows flashes of starter talent behind McCoy. Still raw and inconsistent. Years away from impact, but he's clearly a guy who could obliterate his current price if things break the right way for him.
26. David Wilson, NYG - I was never a massive fan and with the tough season and injury issues, I would have a tough time giving up anything of note for him. He's still young with exciting athletic ability, so you never know...
27. Frank Gore, SF - He's like the Energizer Bunny. He keeps going...and going...and going. Should still be viewed as strictly a 1 year window guy given his advanced age though. Anything beyond next season would be a pleasant surprise.
28. Danny Woodhead, SD - A short-term PPR fix who has value because of his role in the offense. Limited shelf life and upside, but could provide a significant boost over the next 2-3 seasons if they continue to feed him targets.
29. Darren Sproles, NO - A better, older version of Woodhead. Much like with Gore, you shouldn't expect all that much beyond the next year.
30. Darren McFadden, OAK - Utterly incapable of staying healthy, but he's a free agent after this season and he could have spot starter value when available.
31. Lamar Miller, MIA - Having an okay year in Miami's committee. If his role expands there's some upside to crush this ranking. I don't personally think he's a special talent as a RB though and without great immediate value, I don't see a big incentive to hitch my wagon to his career.
32. Shane Vereen, NE - I don't like him that much and I think his ceiling is limited by the presence of Ridley. Still, there might be enough targets here to make him a RB2-RB3 in FF when he's back healthy.
33. Andre Ellington, ARI - Has shown flashes of explosive big play ability. Can he become a workhorse back ala Jamaal Charles? That is the best case scenario. There's also a risk that he's basically just Jerious Norwood. Plenty of upside as a RB4 or MAYBE a RB3. I would not pay top 20 RB prices for him.
34. Montee Ball, DEN - He was supposed to be the starter in Denver and so far it hasn't materialized. His profile isn't all that different from Moreno's. Standout college runner who lacks special physical tools. I could be talked into taking a cheap flyer on him, especially if his value keeps tanking, but I never had enough faith in his talent to pay a steep price for him.
35. Marcus Lattimore, SF - An interesting buy low proposition for rebuilders. I always felt his talent was overrated and I never thought he'd be able to stay healthy, but if he emerges from the competition to become Frank Gore's successor then he'll (at least momentarily) have a lot of value.
36. Toby Gerhart, MIN - The main appeal here is that he's set to hit the market in free agency this spring and there are any number of teams in the NFL where he could instantly achieve RB3 production. I don't know that he's substantially less talented than LeVeon Bell and Eddie Lacy. The primary thing keeping him from producing on par with those players is a lack of opportunity. With that possibly being corrected soon, he's a cheap lottery ticket. If he signs in a bad spot you can cut him and be done with it.
37. Rashard Mendenhall, ARI - Having a very pedestrian year in Arizona. Seemingly on the injury report every week. He's done nothing to boost his stock this year, but he's a free agent again in the offseason and may find another opportunity to claim a prominent role.
38. Knile Davis, KC - Very cheap to acquire given his draft slot and size/speed ratio. I don't believe in his long term ability, but he's plenty capable of looking great over a brief stretch of time ala Murray or McFadden.
39. Mike James, TB - A decent no-nonsense power back in the mold of BJGE or Brandon Bolden. Capable of thriving in spot duty, but not so talented that he's a guaranteed future starter.
40. Shonn Greene, TEN - A little bit better than given credit for. He's already carving into Johnson's workload and there's a non-zero probability that he'll become the outright starter within the next 1-2 years. His upside is quite limited though.
41. Maurice Jones-Drew, JAX - A shell of his former self. Hobbled by injures and age. I think he's basically done. His best bet is to land on a new team and have an Emmitt-in-Arizona or maybe even a Dillon-in-New England renaissance before it's all said and done.
42. Kendall Hunter, SF - Seems to be recovered from his injuries. A top contender for the future starter role in SF.
43. Robert Turbin, SEA - A very ordinary talent who could have some value if he can stumble into a starting role ala Ivory or BJGE.
44. Chris Ivory, NYJ - A mediocre starter keeping a seat warm in New York. Modest immediate value with very little long term potential.
Unless I'm forgetting some names, everyone else is pretty negligible IMO.
I forgot Chris Johnson. I rank him around the 35-40 range. He's old, he seems done as an elite player, and he's not even all that useful now that Greene has returned to eat into the pie.