They made him a complete mental patient (in reguards to the "The Batman" version), and not a slightly insane sadistic gangster. I got used to it, but the only REAL Jokers IMO are Ceasar Romero, Jack Nicholson, and Mark Hamil.
I hope this movie Joker's more like the original.\\(would be fun to see Egghead or someone from the 60's series reimagined in a dark style, though.)