Liked it quite a bit, but was also somewhat underwhelmed compared to the overall rapturous reviews:

http://www.rottentomatoes.com/m/restrepo/

Another excellent film which I actually liked more and which felt more visceral was an A&E film called Combat Diary: Marines of Lima Company about Lima 3/25 in Iraq in 2005. Most of the footage in that was actually shot by the Marines themselves rather than an embedded journalist.