Even if healthy toward the latter half of the year, I really think he's going to be a minimal part of the gameplan. In that sense, he's not worth rostering in redrafts.
My question really is what his dynasty value is. Most spent a fairly high draft pick on him, and he's shown enough to suggest he can be a very good WR in this league, but there's just too much negative about him. It reminds me of everyone who kept Charles Rogers year after year thinking he was finally going to stay healthy and break out after showing minimal, but encouraging, play. And we all know how that turned out.
Crabtree had more yards in his rookie season than Rogers had in his career.
I don't think Crab is a cancer or a complete headcase. He's a diva, but he competes hard when he's actually on the field. The biggest problem that I see is not character, but health. His foot is messed up. Hence why he can't play at his best right now.
I think his best value in dynasty is for rebuilding teams looking to get a potential top 20-30 WR for 2012+ on the cheap. Owners that have him are likely to be frustrated. Assuming that you aren't in contention, maybe you can pry him away later in the season for a really low price like a 2nd round rookie pick or some last-legs veteran.