I have several, but whenever someone mentions guilty pleasures, Event Horizon is one of the first ones that pop into my head. While no masterpiece the film is incredibly well shot and made an impression on me when I was younger. And it's a lot of fun in a certain kind of way.
A list of excellent films. I do question the guilt level on most of them though.
less a guilty list, more a list of movies that I'll stop and watch if they're on TV. Add Fifth Element to that list as well.