It is an incredibly good game, but there was nothing UNIQUE about it.
The way I see it, it is a very good FPS with disappointing graphics (MGS4 spoils you) and great action, but nothing to really distinguish it from the pack other than the fct that everything works so well.
No destructible environments, no ripping turrets out of the ground, no blasting your opponent into a thousand pieces with a rocket launcher. (Bad Company, Halo 3 and UT3)
The multiplayer is incredible, but not very new player-friendly, like Halo with its automatching.
Also the singleplayer campaign is FAR too short with no real replay value.
In my opinion, it's an 8.5. But that's just me- prefer a good action adventure to an FPS any day...
(Former) Lead Moderator and (Eternal) VGC Detective 
