It was an excellent movie, in terms of pure "movie"-ness. Unfortunately, I think Kubrick and Spielberg have totally conflicting views about the world as we know it, and as a result, it lost a lot. Kubrick has an untrusting view of technology, an icy cold intellectual style, and a sort of fear of the "puppet master," the being that creates and controls.
Spielberg thinks technology is great. He has a warm 'n' fuzzy stylization, and he can't BEAR to show a puppet master as evil (he is one). Thus, I ended up feeling like a lot of scenes were half-way between the two viewpoints, and lost some focus. The most notable was the sequence where Jude Law first makes his appearance (his whole role felt like a cameo). His last scene was the same way.
Oh, well. It was a good try. My girlfriend loved it, but being the cimematical nutcase that I am, I've been overanalyzing it, and I don't think it was all that great anymore.
(Btw, was it just me, or did the last part of the movie feel rather sappy? I can't help but feel like stopping the movie at the end of the second part would have been more interesting...)