He's actually pretty much been the definition of average in terms of runs created since he's been with the A's. (read: reliable)
And if by fluctuating you mean that he had a nagging knee injury that ended with him getting season ending surgery last season, then I agree, his been inconsistent defensively. Oh and he bats left handed.
I'm not saying he's the answer to our prayers in RF, he's just the player that came to mind upon reading knightni's post.