Saw this today and it's the most fun I've had watching a US horror film in a long time. It's difficult to talk about without spoiling stuff. The fact that this isn't you usual Cabin in the Woods/Evil Dead style deal becomes apparent early on, but it escalates, throws a gazillion turns and twists at you and goes ever more crazy without ever derailing. Fun cameo too and one that puts this universe into perspective. Until I saw this film, I hadn't realised how much I'd yearned for a film about a SPOILER:
People have mentioned Scream, but what this is more like is
only it does something similar a lot better and unlike that film it doesn't fall apart at the end. It gives you a real fun ride of a climax.
If the film has one problem then it may be that it's almost a little too clever for it's own good which gets in the way of the scariness a little, but with so many horror films having nothing in their head, a genre film that is being too smart and ambitious makes a nice change.
This is already being acclaimed as an instant classic of the genre, so the backlash can't be far off.