Seriously the best horror movie in a long time. If you like Jacob's Ladder or the Silent Hill games or even 1408, you will love this movie. Not a cheap scare or a thriller movie, the story and plot isn't that crazy and I have no idea why people are saying "it was all over the place."
Psychological horror at its finest, if you have a dose of empathy inside of you, it's one of the most terrifying movies of the century. I think the movie lacked an aesthetic which is why it's not in my top 10, but still, I had to write a review and I NEVER write reviews. It really gets after the mind and doesn't feel out of touch. It's that type of horror you feel in your soul, you aren't scared when you walk out of the theater with that fear of the dark or any of that, but you definitely will appreciate it if you like those psychological horror movies.
All subjective but it deserves a watch, seriously.