I live in Georgia and I went to an SEC school, so I had the chance to watch all 3 play. I watched Hardesty the most, saw some of Tate's games, and got to see a bunch of Dwyer's games which seemed to always be played Saturday night. I do not have a great feel for RB's, but here goes.
A good friend of mine went to Tennessee and every time we talked he always mentioned Hardesty and was waiting for him to breakthrough. I never saw it until this year...282 carries 1345 yards 13 TD's with a shaky o-line and passing game. He really came on this year and what I did notice was he plays behind his pads which is important for that position. I am not sure if he has the top end speed to break long TD runs or if he will be a plodder but he did run a 4.49 40 and had a 6.87 3-cone drill at 6' and 225 lbs. I will watch to see which team takes him, because I feel that with a good o-line and coaching he could be good, don't think he will be great.
Another buddy of mine went to Auburn and was always dissapointed with Tate, don't know if it was the coaching changes, offensive philosophy changes or what, but his production never seemed to match his name until this year (just like Hardesty). He had 1362 yards, 5.2 ypc and 10 TD's with no QB to speak of. He blew up at the combine with a 4.36 40 and a 6.91 3-cone drill. I feel that for a team that runs a one cut, zone blocking scheme he could do well. Again, I think that he will need a good veteran team and strong coach to keep him engaged for him to reach his potential as he can underachieve.
I enjoy watching Dwyer run, and he has posted 2 huge back to back years of 1395 yards, double digit TD's and each year over 5 yards a carry, however this is against very weak ACC defenses. In the Orange Bowl, he was held in check against Iowa which could be played up to good coaching against Tech's triple option. He is a big back, DOWN to 229 lbs at the combine and ran in the high 4.5's (so did Moreno last year which you can read however you chose). I haven't been able to find his 3 cone drill which I believe tells alot about a RB's quickness and balance.
When I look at college production (factor in their team's well being and the level of defenses they face), what I see when they carry the ball...do they have balance, can they plant with each leg and make a cut with burst, do they run behind their pads or are they upright waiting for injury, and how does their 3 cone drill and shuttle drills match up with others RB's their size, I would rank these 3:
1) Dwyer
2) Hardesty
3) Tate
I would be really interested if Washington uses a 3 round pick on Hardesty though.