His performance was definitely over-hyped as a result of his death. Still, I thought he was brilliant.
Bane is a good villain, he just seems a bit of a letdown when compared to The Joker, because he's all brawn. I think Nolan could have made it the best of the three by introducing The Riddler to add that battle of wits. Not sure how he'd have managed it though, the film is already nearly 3 hours long!
Maybe he's saving it for The Justice League when they reboot Batman AGAIN and bring in a load of other DC characters. Doesn't really make sense to me, as Superman is basically a god in tights. At least in The Avengers, they're all capable of being defeated (except maybe Hulk, but he still has a mortal form), and you could see they were visibly exhausted towards the end. I guess it just means kryptonite will making an appearance in the storyline...