Yea... I probably shouldn't have watched the trailers either. I remember seeing a few previews of the first Matrix on TV, and I was like "Awesome! Have to see that!". But when I saw the movie in the theatre, I had absolutely no clue what the movie was going to be about. Even up to the point where he takes the pill, and then he wakes up and is disconnected, I had no idea that was going to happen. Every second of the movie was new to me and very cool.
And at the time, the slow time effects they used was never done before, which made it even better. And the soundtrack was awesome.
With Matrix II, I saw too many trailers, and I already knew Neo's character and the whole point of the movie, and combine that with a lousy soundtrack and the obvious cgi effects they used in place of the slow-time - in fact when they used it, it was out of place, it was forced - and then the abrupt anticlimatic ending...
Also they seemed to skip a lot of what made the first Matrix so great. Between scenes, they would go into a transition of traveling through the green matrix like conduits, it was a cool effect, but in 2 they didn't do that. In 2 it was like "okay next scene, done, next scene, hurry to the next scene, more fighting, done, next seen, oops to be concluded"