Share 'Cabin in the Woods - may have spoilers!!!'

Has anyone seen it?  Thoughts?   I saw it last weekend.  I don't want to post spoilers, but I'm not even sure what would be considered a spoiler.  So don't read on if you can't wait to see it and know nothing about it. I kept hearing how great this movie was, it had a mid-90's on the tomato meter, I heard references to Hitchcock and some of the classic ghost story kind of things. I had no idea it…