I'll be the first to point out something I didn't like. I think the one great thing this movie lacked was the Joker's cynical laugh. Ledger didn't laugh anywhere NEAR as much as the Joker should. The part where he was hanging upside down laughing was one of the best parts.
Other than that, I think he did a great job.
And (SPOILER) I was surprised to see Debo throw the detenator out of the window. That touched me *sniff* lol
"Gratitude unlocks the fullness of life. It turns what we have into enough, and more. It turns denial into acceptance, chaos to order, confusion to clarity. It can turn a meal into a feast, a house into a home, a stranger into a friend. Gratitude makes sense of our past, brings peace for today, and creates a vision for tomorrow." -- Melody Beattie