Quite a mixed bag. The opening scene is quite a creepy build up & offers promise. For me, it then tails off and goes quite flat. Couple of moments in the latter half of the film that are good, but quite a bit doesn't seem to fulfill. Plus there's things that happen or about the main characters which aren't really explained so we're left trying to fill in the blanks.
It was OK, and certainly better than a lot out there recently, but it falls short of the hype that was built up.