Inception is going to be a classic. Christopher Nolan is a brilliant film maker (Memento was great. Dark Knight was a bit overrated).
Dark Knight was only that good because of Heath Ledger as the Joker. That was the first truly evil character of any of the batman movies, and he pulled it off perfectly just like the original completely psychotic Joker from the comics. The other movies usually wanted you to sympathize with the bad guy in some way.