This is not my opinion, but the person who's opinion it is wont post it, because he thinks he will be banned for having such an opinion.
This person's opinion via copy paste from IRC:
<Daigo> after playing the kz2 demo just before this conversation
<Daigo> I'm considering cancelling the pre-order
<Daigo> going to think about it for the next few days
<Daigo> as much as the neogaf playstation fans want to deny it
<Daigo> this game copies so much of cod4
<Daigo> except it has a really shitty cover system
<Daigo> and better graphics
<Daigo> it took these guys way longer to make the game and yet it's a copycat and isn't as good
<Daigo> oh yeah they also add more swears for effect
<Daigo> saying fuck in every line proves that this is a man's game
<Daigo> a MANLY MAN'S GAME
<Daigo> DO YOU HEAR ME
I did not play Cod4 so I cant argue against his opinion, but maybe someone can tell me if he is way off base?
I think the demo was fun, and knew I was going to buy this based on how much I loved Liberation alone.