The main thing I want to point out is the way the movie addresses PTSD. I served in the Marines during the same time as this movie is set, and Fallujah was no joke. When I came home I was having seizures and really bad nightmares myself. So addressing this in a more in depth was great.
Secondly the perspective of how a solider felt about the war was also handled very well. Way different than the movies like Jarhead.
All in all this is an excellent movie. I read a review that said this movie is trying too hard to be smart. It doesn't try, it is smart.