ACTION MOVIES!! Nothing beats a great action movie with tough guy lines, explosions and lots of kills. The best would be Die Hard, Bourne and Dirty Harry. Some of my favourite movies of all time.
I quite like comedies if it's decently made. Non of this look at this person mess up sort of things, real comedy that's had some effort put into it. I'm also quite partial to horror movies, I like the cheap thrill ones but the ones that really get into your head are the best ones. I know, polar opposites right? xD
I like comedies, dramas, and sci-fi/supernatural movies. That pretty much covers the entire range, I realise, but I love movies so much that I don't like the thought of restricting myself. The only movies I won't see are ones that are scary or excessively gory - not because I have a squeaming stomach, just usually movies with excessive gore have excessive gore because that's all they have to offer.