I'm still hesitant. After watching the trailer the first time, I thought the Joker got angry too easily. On the one hand, he's supposed to have this unflappable quality to him and kill with a smile, but on the other hand he's totally unpredictable so it's kind of hard to balance. I'll have to watch it a couple dozen more times.
Btw, I'm still wondering, wtf does Anthony Michael Hall do in the movie?