Lot of haters apparently, but seriously this game is very good, and for me it trumps COD all day long. Im having fun playing an FPS again.
The only people who have directly opposed what you said were Gamgee and Suffca, I'm not sure if that qualifies as "lots" of haters or even if they are "haters." The concept of a Call of Duty killer is, presently, as silly as the concept of a "WoW killer," because unless Killzone 3, like MW2, has made more than a billion dollars and has at one point had over 25 million unique players, it's not a Call of Duty killer. Does that mean it's not better than Call of Duty: Enter Title Here? No, and I can't say if it is or not as I haven't played it, nor have I played the most recent COD title, Black Ops. But it takes a lot more than simply being a quality game to become a Call of Duty killer.
Edit: I am Antibody, extreme abuser of commas.