If you never played a Red Orchestra game, you might want to grab RO2 in this Autumn sale sometime (it will probably be a 1 day -75% deal. Just checked and its at 50% off now and normal price is cheap)
I was disappointed with it after RO1, but its probably a half decent semi realistic FPS. Get it for multiplayer tho, there is a campaign but its basically the multiplayer maps with bots
They just released a new trailer with their last patch: