I live under a rock: I just saw The Cabin In the Woods for the first time (thanks EW for the recommendation).
This is a post-modern teen slasher movie.
It is not in the class of Scream.
Having said that, I found the theme and plot very intriguing (no spoilers here): group of teens go to the cabin in the woods, and bad things start to happen, for species-existential reasons.
FWIW: When things really started to get crazy near the end, I said to the vXwife that I wanted them to get this over with so that Sigourney Weaver could come in and tell us what was going on. I had no idea that she was actually in the movie when I said this. I could have just as well said Morgan Freeman, but this time around I nailed it.