This is a VERY graphic movie, and was kind of strange for myself to watch it; I've never seen a movie anything like it, but most of the "graphic pictures" were off screen, and filled in with the mind. It's definitely a non-mainstream, "different" movie, with an altered plot and violent actions. In the intro, for a few seconds, the movie plunges into a deeply black metal track. Now; I've heard songs similar to such, and I was even disturbed, but with people who have never heard such a musical genre, they are bound to be even more startled as well.
Personally, I thought it was a pretty good thriller. The plot was very skewed from of what an original movie would be like, however, this is why I liked it. For people who like strange, upsetting "mental" thrillers with a twist, this movie would be for you.
However, this movie is NOT FOR KIDS under any circumstances. I myself am 15, and I strongly suggest that this movie be viewed if you aren't "frightened" easily by obscenely violent plots (for example, if the PG-13 movie, "The Woman In Black" scared you, this is on a COMPLETELY different level. Watch at your own risk).
All in all, I give the movie a 3.5/5.0 stars.