Killzone 2 is a game in the same vein as the movie Black Hawk Down.
The story is as follows: shit happens, military-type men go after those who caused said shit to happen, initial assault against shit causing antagonists, buzz-headed military-type finds himself in the shit with comrade military-types split up into smaller groups, sub-groups re-unite into whole, military-types push toward shit-antagonists capitol, military-types push through capitol, high-and-tight wearing hero-type kills evil dictator, death of dictator enrages shit-antagonist population, hero-type realizes that all this shit just made shit worse.
All this shit goes down with a gun -- two guns, mainly. Standard issue Vespon and Helgan guns are the order of the day. Something higher caliber, a sniper rifle, and rocket launcher, and a couple pistols flavor the order a bit.
The game's pretty looking. Killzone 2 looks as good as mid-nineties movies presented its imaginary games to be -- for realz.