Bizarre movie, because of the main character. He can fire a gun, command a unit decisively and concisely, and talk on the radio and telephone. But whenever he must have a conversation face to face with another character, he blanks completely, and becomes speechless. I can't decide if Damon can't remember his lines, or if Miller (his character) is stupid. Miller learns what's going on, piece by piece, of course, but at key moments when he must converse with allies in his struggle, he repeatedly loses his train of thought and just stares mutely. In a war setting like the film's, an important skill is bringing others to one's side, and these are the crucial moments when Miller blanks. Fortunately, prior events in motion drive the plot onward so that the film doesn't halt as a result of the forgotten lines.
This movie will be stressful viewing for people who value communication.
This movie goes beyond the standard Iraq action plot (fighting against dual enemies—Iraqis and US immediate superiors), and brings in Washington DC intrigue. For that reason, it is much more enjoyable than just grunts blowing things up, getting blown up, and seeing how many curse words they can fit into 90 minutes.

Its about the false allegation of US that Iraq had WMD. Which turns out to be a manipulated intel for personal gains of few people.

Whilst I didn't hate this film, I really did wonder who on earth it was for? Is it just one of those retrospective conscience-salving efforts designed to deflect the attention of the audience as to just who told us all what ahead of the invasion or Iraq? In any case, the plot seems to suggest that that whole invasion was predicated on an elaborate American scheme to install a puppet administrations in that country. Based on what, precisely? Well - that's what "Miller" (Matt Damon) and his team of elite WMD hunters are on site to discover. What now follows is a rather pedestrian affair with loads of CIA cloak and dagger drama as the team constantly come up empty in their search. Is there a leak somewhere? Did the things just simply never exist? Is their a broader game afoot? Well those are the questions about which I couldn't say I was really very bothered. To make these intrigues work effectively, the writing and the acting have to be far sharper and nuanced than here in this rather simplistic take on not just the Allied (i.e. not just US involvement in Iraq) activities, but on the attitudes of the local population who are portrayed here as either little better than sheep farmers, or as duplicitous murderers. Damon is going through the motions, as is a slightly oddly cast Jason Isaacs ("Briggs") and a completely underwhelming Greg Kinnear as "Poundstone" - the Pentagon man charged with leading the search. Add to the mix the faintly annoying interventions of investigative journalist "Lawrie Dayne" (Amy Ryan) and the whole thing is, frankly, a derivate mess. At times the pace is active, but for the most part is just plods along towards an ending that is probably all that this speculative and weak script could hope to offer us.

One word.............UNDERRATED!!!!!!

I saw Green Zone in the cinema when I will in school and kept wondering why this film isn't talked about more, really hope with time this film will start to get the recognition it deserves as it tackles a subject that a lot of modern war films don't as it shows the corruption from both sides of the war in Iraq. This film shows how many lies the army was told to get the job done and shows the harsh reality of war and the casualties it leaves behind.

The stand out performance is Matt Damon (Roy Miller) as so many people like to say "He barely does anything during the film" but that isn't true as he is trying to push forward but it shows how unfortunately soldiers are not allowed to think and act for themselves sometimes and he plays that perfectly, I also have to give credit to Khalid Abdalla (Freddy) who really does show you the casualties of this war with just one character alone.

If you like Modern War films then I recommend Green Zone, this is destined to be a modern war classic in my opinion and with time will get the credit it deserves.