I just watched Cabin in the Woods and was thoroughly unimpressed. If that movie can't take itself seriously why should I? Maybe you could argue it's a super meta critique on the cut and paste unoriginality of the horror movie industry, but even then, just blog about it so I don't have to sit through a silly movie that can't decide if it's a comedy or a horror film.
It's a bit campy, yes but I can't see how it's as bad of a movie as your'e making it out to be. You have to embrace the campiness of it and you'll enjoy it. I walked into it completely cold(didn't even know what it was supposed to b about or what sort of move it as), and I absolutely loved it. I especially loved all the monsters that were references to other movies/games. The entire plot was a little thin, but it was revealed in such a way that you didn't realize it till the movie was over.