Take all your favorite shooting games, put it in a blender, add strawberries, multiply that by 100 and your close to KZ2
The controls had me skeptical in the beginning, but after 20-30 minutes or so, I had mastered it. And mastering Killzone 2's control scheme is rewarding on it's own.
The Graphics speak for themselves, and it doesn't sacrifice good looks for slow down, I never hit framerate issues once and of course online will always encounter the occasional lag/connection problem.
The sound F/x are simply bad@$$. You'll never forget the sound of those darn grenades, nor the sound of a medic healing you. Single player is jam packed with rampant assualt rifles, rocket launchers, flame throwers, grenade launchers, it all sounds good.
Killzone 2 is like a rare gem of a summer blockbuster film, it has high production values, a big budget, and it packs a huge whallop of an entertaining punch. People that are FPS fans and have a PS3 (or dont) and are dismissing this game for some strange reason, simply need to jump off a building.