Cloverfield, from what I have heard, is just a monster destroying New York City. Pretty simple concept, sort of like Godzilla, I guess. I also read that it was shot with hand-held cameras, so if you're not one for a shaky picture, then the movie might not be for you.
EDIT: I also caught AvP 2 this weekend, and I liked it for what it was. It was entertaining, and definately better than the first movie. Of course, that is like comparing poop to a brownie: the brownie will always be better. The movie was no masterpiece, but it was a good action film.