I thought it was great. I felt it was non stop from start to finish. Went for authenticity and didn't do the normal silly things like two blokes standing there talking about how one has a hot wife to return too. Rather it merged 3 points of view.
On the merging the 3 different timelines was the difficult bit until it clicked (1 week, 1 day, 1 hour), then the movie continued to make sense.
Also, it's so well shot. You could frame so much of that movie and the sound... farrrkk, the noise some things made
Oh and the soundtrack. Gotta give two thumbs up.
Afterwards I thought it's most likely the most different war movie I've seen.