Steven Jackson never got over the "average runner" plateau? That's just incorrect. The guy is a beast and a great RB! His numbers bear this out. However, you are on point that he is a big injury risk. I doubt I'd give up anything higher than low 4th or 5th for him.
Finesse?? the guy is 6-3 230. have you seen him without a shirt? he has muscles in places where you don't even have places. He gives you 1,100 yards a season and 40+ catches ... and thats WITH all the injury time missed. if we could get him for our fifth round pick and a player or two, I'd do it in a second.