I liked it. It had everything I wanted from it, plus a little more. I wanted cool effects, fight scenes, and pretty people in black. I got that. There was also a respectable amount of plot. The story went places I wasn't expecting.
The soundtrack wasn't quite up to snuff. It looks like it was pretty much the same people, but it didn't have quite the same feel.
All in all, a good follow up to the Matrix, but definitely a "second movie". I have high hopes for the third one. Though I'll try to forget those before December; nothing convinces you a movie will suck better than going in expecting the best thing you've ever seen.