
Shoot, get behind cover, throw the occasional grenade, run around with a shotgun, or snipe, blow up explosive barrels, control a turret, ride in a vehicle, and paint a target or two. This one sentence basically covers the whole game. The story is filled with generic characters from a hyperly-aggressive "I-don't-give-a-shit" grunt (eerily similar to Rico from Killzone) to a more compassionate female companion. Your character remains mute and soulless.
I haven't tried the multiplayer so I can't really comment on it.
The single campaign takes only a day to beat, so unless you're really committed to the online component, this is a rental at best. If you still want to shoot Koreans, I recommend Crysis instead.