I agree with you actually.
 
A) Scars, the Joker in the comics is Perma-white. B) the Grungy look, don't they know the Joker in the comics is all about style and class or at least in look C) Little theatrics, the Joker just killed people a lot of the time sure some theatrics but not a lot D) The Joker in the comics has never once acted as if he's some ****ing philosophy teacher, sure, sometimes he teaches "lessons" but he doesn't go around acting like he's Socrates with a machine gun E) Lack of gas, he used a knife, same effect but not really true to the character. Sure, they had the Murdering/Psychopath/Clown down but a lot of stuff just wasn't there.