There are a lot of hitters who have been very good ML players who don't pull the ball when they could. Usually it means they give up some power (as you normally have a lot more power when pulling it, if it is one you "should" try to pull), but they do tend to be higher averages to balance it out.
I don't know much about his speed as far as base-stealing potential and such, but every line-up needs guys who are very good at just putting the ball in play (singles/doubles type hitter). You want a balanced line-up.
From all I have heard, his "return" to position player makes me think Hunter Pence is more expendable now than he used to be. (dreaming the impossible Peavy dream...) I don't know about Bogusevic's ability to play CF, or I might think he could push for that spot too if he can.
It is still very early to tell for sure if he can hit at the big-league level, but so far all indications are looking favorable, IMO.