Incredibly boring for half an hour (Paranormal Activity shot with a movie camera). Then it turns into a rip-roaring horror story, a really good one!
A very cool idea—and I always enjoy watching Bradley Cooper—but eventually it ends up getting moralistic and preachy, and let me down a bit in the last third. I wish that it lived up to its title but unfortunately it was limited.
Doesn't ever bore you, doesn't particularly insult you, doesn't make a lot of sense. A crowd pleaser.