This is a very good movie, and I have to give it to Christopher Nolan for thinking big. I liked many of the underlying themes that added depth and dimension (heh) to this world approximately fifty years in the future. Having said all of that, I prefer my sci-fi a bit harder, though in all fairness this was probably about as hard as a movie could be while retaining commercial viability. (If you're not familiar with the terms "hard" and "soft" science fiction, here's a Wikipedia thumbnail description.)
It's hard to write much more about this movie without re-hashing what other reviewers have said, or inadvertently letting a spoiler fly. Let me just give my rating: 3.25 out of 4 stars, and refer you to reviews by James Berardinelli and Flickfilospher.
Overall, this was not what I was expecting, but that's good when a story has some additional twists. Not really a question of "exceeded" or "did not meet" expectation, more of it took some batshit turns that I just didn't see coming. I'll have to see it again at least once. Definitely a spectacle not to be missed.
ps: Here's a spoiler-riffic wade through this movie's missteps over at Up Ship. Again, that review is all about the spoilers, and the technical problems therein. Yep, too much 2001 and not enough reality.