It's entirely possible that sending the audience out feeling lousy was intentional

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.

The film never slows down or bores, plunging from one harrowing sequence to the next.

There are moments in this movie where the great movie it could've been peek out... They're fleeting, here, but they're worth savoring, and they happen often enough to make it worth your while.