Why be a rookie hater? WMP is a year and a half older than Ellsbury and hasn't really played a full season himself.
The defensive metrics do say that WMP is not a bad fielder. Apparently in the games he has played in he has gotten to the right number of balls compared to league average to make himself appear to be good.
Statistics make up for plays unseen. I haven't missed many games the past few years and this guy isn't a better CF than Crisp. He simply isn't. I would be willing to bet Crisp has better defensive tools in any of the three positions, except perhaps his arm in right. That doesn't mean Crisp is a gold glover. he makes many bad reads. But WMP is just bad sometimes in the outfield and is a roller-coaster every other day. I would say this is a place where fielding statistics simply haven't caught up with what is observable by anyone who actually watches them play.
Another possibility is that Crisp is actually playing better in CF this season, as he appears to be getting to just about everything hit his way. Perhaps the stats will be lopsided next year and Crisp is just showing what a year of playing CF can do for your skills as a young man with great speed.
I'm not ready to get rid of Crisp. As I've advocated many times I think he would be the ideal 4th OF with Ellsbury leading off and playing CF. WMP should be converted to a 1B or so Youkilis can move to 3B, or he should be dealt. I agree with you that we haven't seen what he can do, which could preserve his trade value. His power remains largely "unknown" which I think could net something nice.