Cabin in the Woods is a spectacular film. It’s nothing that you’re prepared for going in and to reveal too much is to do it a disservice. The only thing I can recommend is to see it. It sets itself up to be tongue-in-cheek, but it’s so well executed that it deserved a much better response than it had originally received.
It’s a horror film - but it’s so much more than that and I think only Joss Whedon would be successful at pulling off something like this. It’s great. Get to it.