It's hard to see any effort in the film. There's no comedy to speak of, no real drama and, worst of all.

One of those movie experiences that is so good it makes you realize you've been grading everything else on a curve.

While it doesn't offer any answers, it both thrills and makes you think.

Just intense enough to provide a much-needed diversion, just lightweight enough to make you forget about it soon after it’s over. It’s not exactly “good,” per se, but it does what it sets out to do in terms of putting us on edge, which makes it … successful?