Killzone 2 has much to prove. The first Killzone, released for the PS2 back in 2004, was hailed as a "Halo killer" before release, a rather unfair burden that it ultimately failed to shoulder. Graphically ambitious, its tale of ferocious future war was perhaps too much for the poor old black obelisk to handle. The frame-rate was sticky, the draw distance short. Review scores, inevitably, were mediocre. Then there was that big kerfuffle about pre-rendered footage, screenshots that were scrutinised to an impossible degree, and the lingering insistence from vocal gaming "enthusiasts" that each new PS3 exclusive must apparently single-handedly prove the worth of the console in every conceivable way.