I don't hate a particular genre, since I feel that every genre can have good movies. I don't care too much for horror movies, and while I've seen quite a few good ones, a lot of horror movies never really did much for me.
The kinds of movies that I hate more than anything is any movie that tries to be artier and smarter than it actually is. I remember watching a movie called "Head", which starred The Monkeys and it tried to be this arty, psychedelic movie that had moments that comment on consumerism, and a bunch of other crap, but it just came off as random bulls**t that never comes across as smart. The movie was just lying to the viewer and itself about how thoughtful it is. I just watched Under Siege with Steven Segal, which was a cheesy action flick, but at least that movie never tried to be smarter than it actually was. I just feel insulted and feel like my time was wasted watching a movie that tries to be arty and use a lot of clever symbolism and all that crap, but it's all meaningless if you don't have a good story to back it up.
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"I never lose. Not really."