I've already managed to play two levels of Killzone 2 yesterday and I simply cannot believe how good the graphics are. Every cut scene is an amazing feat of graphical design that only the PS3 could handle, and the levels have such graphical detail that they'll visually stun you. The gameplay is excellent, with intelligent enemy AI and accessible controls. The only annoying thing I've found so far are the occasional times where you have to use sixaxsis to turn submarine-hatch type wheels to unlock doors. Luckily they only appear once per level. I'll write a full review in a few weeks time.