Some reviews of this film have described it as "tripe", "slow", and "dull". To a certain extent I agree; if you are expecting an all-action investigative thriller (Die Hard style), look elsewhere.
At the helm of the film is a study of, as the director puts, "the first victim of war; our humanity". The story revolves around PTSD resulting from war, the difficulty soldiers of all nations have reintegrating into 'normal' society, and the problems war-atrocities create. My one criticism of the film is that it does perhaps take on too many central themes, attempting to look at issues surrounding the afore-mentioned war ideas, parental problems, the 'right' to kill, de-humanisation etc etc... A lot of thinking is required. But, this said, it does most of this competently and transparently.
If you are interested in any of the above, and especially if you liked Waltz With Bashir (covers a lot of the same themes - although Waltz is probably better), definitely worth a watch.