"SOCOM: U.S. Navy Seals Confrontation" is basic. You choose your weapons: shotguns, rifles, machine guns, etc. Then you go online (it's an online-only game). You join an existing team of soldiers (among thousands already online), or start a team.
Then you get to the killing. The battlefields are basically little towns of buildings and ruins. Playing it sort of feels like playing football on a huge field riddled with hiding places. If you run cavalierly down a street, you will likely get shot by rival soldiers running down the same street. This is often a madhouse of pain.
There's no plot, no characters per se - none of that. But if you're a military gamer, you'll love how smoothly you run, hide and fire good weaponry. And the war zone is fairly realistic looking.
It's $40, but for $60 you can get it bundled with a Sony wireless earpiece - to chat with other gamers - which, of course, you can also use in other online games.