I just posted this in the Official KZ2 Thread:
Wow. That was an awesome demo. Really short, though. Like 10 minutes.
I thought there were meant to be two levels and a tutorial!
Anyway, the beginning seemed a little abrupt, I'm guessing it wasn't the real beginning of the game, so forget that.
The controls took some time to get used to, but after a while, I was headshotting Helghast left and right. The shooting felt brilliant. Although I admit I cheated a little. Alternate 2 with hold zoom on. And yet still VERY different from CoD4.
The graphics...mindblowing. It, frankly, makes MGS4 (in and only in the graphics department) look subpar. I've played Gears 2 and anybody saying Gears has better graphics is either basing KZ2 graphics off screenshots (they don't do it justice) or lying. Next to Crysis, the best graphics I have EVER seen in a game.
The AI was remarkable as well. I went into cover, and he chucked a grenade at me, and rushed to cover himself! It's so simple, yet I've never seen any other enemy do that! Sure, they throw grenades at you, but with no real rhyme or reason. This was different.
The Helghast are nice and easy to see (and shoot) with their orange eyes. L2 to snap to a wall, peek up, and either iron sight shoot or just fire and kill the damned things. So satisfying...
I played the RE5 demo after this. It felt crap after KZ2. Maybe I should try it again without the awesomeness of that demo fresh in my mind.