CNN has an article on the popularity of war-themed games in the light of the war in Iraq. Best-selling PC game in the US: Delta Force: Black Hawk Down. Number two: Command & Conquer: Generals. Battlefield 1942 and its expansion pack Road to Rome are also in there.
You may already have heard of Underash, the FPS developed in Syria, where you play a young Palestinian stone-thrower, Ahmed, fighting Israeli soldiers and settlers. Here's what the developers of Underash say about the political message of the game.
The subject of ideology and political messages in computer games gets a fair amount of interest from the academic community, judging from the DiGRA mailing list.