Cabin In The Woods had me until they got to the secret base and every single horror movie stereotype started happening. I don't care if that's what they meant to have happen, it took the punch of originality and fresh breath of air out of the movie and just got really stupid to watch. Why the fuck would there be a button to release every single monster in a checkpoint booth(I've seen people say it was to laugh at the idea of a big red button but fuck that, doesn't make it any less stupid and cringeworthy), with as someone else said, the tacked on as fuck ending.
Great first half completely ruined by the following half.
Of course IMO.