He has a career batting line of .231/.336/.380.
Since 2008, he has a batting line of .226/.360/.394, with a modest .301 BABIP.
He's left-handed, there's little evidence that he has a giant platoon split, he's had excellent success in AAA, he's arguably one of the better defensive outfielders in baseball, and he's only 30 years old.
He needs to be a starter. Somewhere, for at least a year or three. He is a multi-million dollar player who's just been dying on the bench for far too long.