OK, so I'll admit I was expecting something closer to the graphic novel, and I was pretty disappointed that it only really loosely followed something that was epicly brilliant as the comic.
However, I'm not a stickler for total accuracy.
And, really it is better than most of the other Batman movies, it does manage to tell a good story and reveal some of the Joker's ever-changing and never consistent backstory, even if it does gloss over a lot of it.
In the end, especially in this current era it's a reminder of how great comic books used to be and how great they could be again if they only started telling actual stories once more.