Having good scores does not mean it isn't generic. If you read the reviews most of them touch on the blandness of the story/setting/environmentsKillzone 2 has an average review score of 91 and a user score of 81
The weight made the game feel different than any other fps.
But mostly the constantly rotating game modes.
The "weight" just felt like lag to me. I guess that is different but not a good thing in my opinion.