While I thought it was the weakest in the trilogy, I did think it was much better than most of the other Batman films that predated it. I liked how Christopher Nolan didn't mimic Batman, he recreated it.
Like Bruce Wayne's back-story where he's searching for his true cause. He eventually gets trained to be a psuedo-ninja, but I hear those guys hate hippies.
I also liked Katie Holmes as Rachel Dawes. It's a shame that the boyfriend-girlfriend thing didn't last for them.
And forget Scarecrow, he was lame. Ra's al Ghul (who ironically is not a well-known Batman villain) was the real antagonist. I love how they pull the surprise on Bruce during his birthday party. Their final fight was also pretty sweet.
It could have been better, but two far superior films succeed it. So it's all good.