Horror is a very divisive genre. What's scary to one person can be silly to the next. Furthermore, many horror films are created with the intent to disturb the audience. Not everybody is into that, and sometimes you think you're down for anything, only to see some stuff that really messes you up.
These films deliberately cross lines, and that can be a dangerous game. As strange as it may sound, there is a right way and a wrong way to portray a guy's skull getting bashed in.
These are some of the most divisive horror films out there - people either love them or hate them. If you thought the film was a masterpiece, vote it up. If you thought it was a hot piece of trash, vote it down.