I picked up Powell in 1 dynasty draft, mostly because my top 5 WR's are Nicks, Dez, Jennings, Wallace, & Fitzgerald. I used all my picks on RB's. I don't think Powell is anything to be overly excited about, but he has a good situation and he's worth a gamble. NY is gonna pound the rock, Shonn Greene isn't cemented as the back of the future, and a team like the Jets, or Ravens who run the ball a ton, almost every RB that makes the roster is worth a good hard look.
It's hard to get a good feel for what type of player he'll be until training camp.