I got my ticket yesterday, for tomorow, and I'm excited. I may speculate a bit here, since I have a very good diea of what the third will be like.
The second two by their very nature can't be the same as the first, since we already know "what is the matrix". That cn't be undone. While I agree about the fight scenes, what I loved about the first was the multiple levels - Action Movie, Social Comment (We're all slaves to the system) and Extistential Philosohpy. The second dropped most of the social comment (Although there was still some "We need machines to survive" comment) for more philosohpy, but I still thought it was fantastic, mainly because I understood it. Too mnay people hated the film because they didn't understand what the Architect was getting at. I did, and liked it a lot.
I'm guessing the thid will be similar to the second in this respect, so I should find it really good. I plan to appear tomorrow (A day late, but I have an exam in the morning - last one!) decked out in trenchcoat and stuff.
I don't think either are/will be worse than the first, since they'e trying to be different things.