There was a previous thread about this film around the time of its release a few years ago, now probably deleted, but it might be worth a search.
Despite its rave reviews and that it earned some prestigious award, it was not widely screened --- it showed on one screen only in metro Phoenix, and only for a quite limited time, reaffirming my belief that the movie-going public is indiscriminate and largely brain-dead, and probably watches movies and TV as an alternative to reading because they're lazy and stupid and pretty much illiterate.
I thought it deserved the accolades it garnered --- it was chock full of drama, suspense, and gut wrenching scenes of horror and terror. It also includes a scene wherein a Barret .50 BMG rifle is put to very good use, eradicating an insurgent at very long range, worth the cost of admission for that scene, alone. Try it, you'll like it.