The Harvey Dent parts were the only good part.
The Joker was terrible. No character development or explanation. I actually had to look the character bio up. Harvey Dent/Two Face worked brilliantly, purely because I understood the character.

And where Christian Bale is better than Clooney, that's pretty much down to scripting. If you'd put Bale in Batman and Robin, he would've been awful.
( WHARRGARBL, Sun 14 Jun 2009, 3:43, archived)