I don't like him at all, I shudder to think what goes on inside his head.
I do like quite a few of his films though, Rain Man and Collateral being my two favourite, really fantastic performance from him in both films. I don't know how people can say he isn't a talented actor. He does rely on his "suddenly exploding into crazy eyed nutter" routine too much, but when he breaks out of that, he can be great.
This movie looks pretty cool, too.