"Zero - that's how many fresh ideas Killzone 2 brings to the table. Had it been released alongside Soldier of Fortune or Medal of Honor: Allied Assault, it would have made a big fuss. Today, after Call of Duty 4, Gears of War 2 and Half-Life 2: Episode Two, its gameplay looks weak. Very few enemy variations, cliched situations repeat over and over again, and there is not enough story to fill a Saturday morning cartoon."
P.S sorry for that bad translation.