Not playing well? His bat has not come around, but if you watch he has hit a ton of hard hi balls this year that get caught, so when you look at that and his track record as track record there is no reason for a gm not to think he can really heat up with the bat.
And that's half of his game. His defense / fielding has been great. I really don't see how anyone can watch Drew play defense this year then say he has not played well. Dude has been really fun to watch in the field.