Interesting thing about Martin for me is the fact that he's one of those players that seems to have a predjudice attached to him because of having fallen short of high expectations previously.  In 2013, he was a consensus Top 5 pick and he underperformed before getting injured for the season.  Which means alot of owners were really burned off that.  2014 wasn't much different although Martin's draft position had slid down from it's 2013 status down to Round 2/3.  But again...owners that invested in him were sorely disappointed.
And so thru 3 games, when Martin didn't produce at least one solid/solid plus outing...I think there was a vocal group of FF owners who banged a 'here we go again' drum.
Having not owned Martin in 2013/2014, I'd not dealt with the aggravation of owning him.  But obviously, he has a short fuse with many.  Ultimately, his usage pattern to date seems like the Bucs are committed to getting him the ball (18 touches/game), but will not bellcow him.  Big success factor for him will be Winston's development.  But 18 touches is solid usage.  Floor to me appears to be RB2 which is where he was drafted.
		
		
	 
I'm in the same boat as you. I absolutely avoided him his whole career (never had faith in Schiano) but felt he'd reached a good value this year. As of 9/7/15, the FBG aggregate ADP for him was RB26 which seemed right at or below my anticipated floor for him in Dirk Koetter's offense, even with a rookie QB. Yet trolls will complain that his consistency isn't up to par (while not defining what par is that late in the RB player pool).
His first three games weren't great, but he hasn't exactly disappointed compared to his peers. Just for fun (not in response to the above quote) I'll break down the guys drafted around him with a wide berth:
RB14 - Gore - epitome of meh 
update: little less meh than before
RB15 - Morris - no TDs, rookie forcing RBBC, similar stats to Martin 
update: bust
RB16 - Gordon - similar, but worse stats than Martin 
update: bust, but not as bad as Morris
RB17 - Hyde - one big game, three clunkers 
update: 2 good games, 5 bad/mediocre games, now injured
RB18 - L.Murray - good, not great (lot of short rec if you get points for just catching them, very low YPR) 
update: similar to Martin
RB19 - Ellington - injured, TBD 
update: relegated to backup after injury, bust
RB20 - Stewart  - between 50-82 yards each week, no TDs, pretty meh 
update: doing better, Martin still preferred
RB21 - Randle - scoring TDs the last two weeks has saved what has been a lackluster 4 game stretch, hold on starting job tenuous 
update: bust
RB22 - Foster - back early to a horrendous offense, TBD 
update: IR
RB23 - Gurley - came on strong week 4, TBD 
update: stud
RB24 - Abdullah - looks legit, but usage baffling (week 2 - 18 yards total) 
update: bust
RB25 - Yeldon - pretty much the same as Martin, but w/o a touchdown 
update: good, not great
RB26 - Martin  - getting 18.5 touches a game, RB24 by average pts/gm in both formats (including current unstartables like DeAngelo, Andrews, Sankey, David Johnson, etc) 
update: top 12 in all formats; 3 bad games, 2 mediocre, 3 great
RB27 - Ivory - looks great, potential steal, week 3's active donut hurt, though 
update: stud
RB28 - Spiller - injured, slowly worked back in, TBD 
update: bust
RB29 - Bell - looks bad, now injured 
update: bust
RB30 - Blount - appears 2nd on the depth chart, but will score points unpredictably 
update: solid when in the game plan, but week 7: 3/-3/0 
RB31 - Jennings - 3-way RBBC, 3.2 ypc 
update: still in RBBC hell
So even though people might not be happy with him, they probably wouldn't be that happy if they had taken someone else around him. And going forward, his situation looks much more predictable than a lot of those guys. Sims is getting snaps to pass block and catch a few passes, but he's looking as pedestrian as last year as a runner (3.4 ypc) despite being in a chance of pace role. Rainey is barely getting any snaps at all. Winston and the offense have looked poor, but at least we know it can't get much worse. The offense 
should improve as the year progresses.