Very broken in so many ways, bad sound, bad graphics, bad story and Abysmal gameplay.
The framerates are very bad too, you would just run along and then the game would just mess up. The camera is very frustrating as well because when you reload your gun, the camera sort of goes down and then you can't see where you are going.
Killzone on the PS2 sucks so bad its not even funny.
Guerilla Games should be ashamed of themselves for making such a broken game.