Good idea for a thread - but keep in mind the sample is not large enough to draw any conclusions from.
I will say this, a lot of these numbers seem accurate (aside from Ellsbury).
Youkilis, now, is a much better 1B than 3B. I think the fact that he's getting older means his range is becoming more limited. Still, being rated as an average defensive 3B sounds about right.
Pedroia and Drew are clearly above average defensive players. Green's number surprised me but he gets to a lot of balls Lugo wouldn't get to.
Bay has very limited range, and similar to Manny a lot of his warts are hidden by the Monster. Unfortunately, the Monster also skews the defensive rating pretty badly. Bay really benefits having Ellsbury next to him.
Lowell is a statue. His hands are still OK but he has no range. Very troubling that his hip is bothering him so much right now.