There's not much to say about this film except that it doesn't seem like a horror movie at the beginning, which is why I love it. The largest bulk of the film is introducing the characters, which is done very well. From the first kill you kind of begin cheering the killers on and you also begin wondering why all the victims are so humble and thankful, but things take a dark a turn near the end. I don't want to ruin a good movie, so I'll just say that the last twenty minutes are extremely claustrophobic and more frightening than any other film I've seen this year.
This is easily in my top five horror movies.