Critics reviews

[The climax] is rather more unexpected and intriguing than the way narratives of this sort tend to end these days. Add to that the committed performance from the cast, the largely effective special effects, and the overall intelligence of the movie, and you haven't quite got an earth-shaker, but definitely a decent scarifying effort that doesn't abjure convention entirely but goes out on a few gratifying limbs.

Precisely the kind of film one would expect from the producers of Paranormal Activity, it relies on the gimmicks of bumps in the night, shadowy figures, and characters spending an inordinate amount of time staring into the distance.

Its politics may be vaguely abhorrent, but at least its iconography actively evokes something real. Most horror movies are bad on simple formal terms; this one is bad in a more serious way.