Every scene that Heath Ledger was in was gold. The rest of the movie was decent, too. I liked "Batman Begins" a lot, and "Dark Knight" is even better. However, I don't think Dark Knight is "one of the best films ever made." It was a really good superhero flick, made great by Ledger's performance as The Joker.
After seeing him as The Joker, I would really have liked to see Heath in some other unusual, intense roles. It's unfortunate that such a talented actor died so young.