Very very predictable, including the post credit scene !!!

Simple and well acted, it has tension enough to knot the stomach.

This is one of the few movies I've ever seen where the whole audience broke into spontaneous, loud applause a third of the way in.

I think this is a new genre that they're all sort of working their way through it and haven't got all the kinks worked out yet but it's a genre that works for me.