good back-story, and good acting

The thing I enjoyed most about the film is the fact that it doesn't shy away from being a super-sized-cliche;

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

The movie is made so realistic it has a lot of that WoW feeling at the right moments and never tooo over the top. the suspense is done so well and the emotion is felt. Very well put together with the music and all.