I shouldn't even have to explain why this is good. If you don't agree, WHERE IS YOUR SOUL, go back to hell, you monster.
This movie is fuuuuuucked up. Completely and distinctly unsettling from start to finish, and at some points, just downright scary. It's a rarity for a horror movie to genuinely scare me. After the last scene, I just sat here for ten minutes, thinking, "Well, that was totally disturbing. I don't even want to get off my couch and walk to the kitchen." Excellent film. Very effective. Highly recommend!