I could spend days talking about how technically impressive Killzone 2 is, but I won't - it's pointless. This is, without question, one of the more technically proficient games on the PS3 and a great showpiece title for anyone trying to convince someone to buy a PS3 (something I'm sure Sony would really appreciate you doing). However, I was more impressed by the game's design sensibilities. Levels are bleak, dirty and not places you would want to visit. While I would have loved more location variety and more blue skies, both would probably feel a little out of place. The dreary look carries through into the menu screens, which feature an odd "out of focus" shift that helps sell the experience.
If sound is 75% of the experience, Killzone 2 goes a long way in proving it. Music has a cinematic flair and is used only when necessary. The rest of the time, the ambient sounds of war are allowed to come to the forefront and sell the rest of the experience. Weapons fire carries a lot of impact and offers a good sense of how powerful each gun is. The only minor issues are with voicework, though this is more of a side effect of the "action movie" dialogue rather than individual performances.