It won't take much to be better than Nicholson. There, I said it.
As a total nerd, I just don't like that Nicholson's joker was just...Jack Nicholson with face paint. The Joker of Batman was generally much more dark and twisted, which is what it looks like Heath went for. Can't wait.
I personally love Tim Burton. Can you honestly say that Sleepy Hollow, Big Fish, Ed Wood, and Nightmare Before Christmas were no good?