When it comes down to it, this movie is essentially a new take on The Matrix. It's highly entertaining, and I'm sure there are details I'd watch more closely for if I saw it again. But at the end of the day, it easily could have been edited down to 2 hours or less, a couple of characters could easily have been left out, and I felt like the writer dumbed down the story - I really didn't need the Leo character to spell out every nuance of the Inception theory - and it made for some pretty pedestrian dialogue.
Rumors of sequels abound, and I'll likely go see them.