to be honest a lot of the games I've seen him play he hasn't exactly stood out, but then at times he does show flashes of brilliance. I can't remember who Arsenal were playing but there was a game last season when they were desperately searching for a goal and Bendtner beat a defender to a long ball, controlled it superbly, turned another defender and then hammered it past the keeper.
He looked so determined to score. I think if he was in the right frame of mind he could still become a very good player. He is only 23 afterall. I think with a consistent run of games up front he could get a bit of momentum going and maybe even notch 15-20 goals. Undeniably would be a bit of a gamble though.