I enjoyed it. There's a real descent into madness, and the acting was excellent.

I'm surprised to see all the hate on this in the comments, but I can see how if you came to it expecting a horror genre film, this would have been really disappointed. I liked it a lot though--great performances, great dialogue, and increasing freakiness from Shannon.

This movie is definitely different. I'm one of those that actually like it, it's interesting, odd as it is.