its a bandwagon.. everything you jus said has been done before COD4..
Mostly all FPS allow you to play run and gun style or as a sniper..
It controls like any other console FPS for the most part..
The maps are too small for how much action goes on in the game..
the unlock system is coo', but rsv2 is a much better game imo and has pretty much the same thing..
yeah, cod4 is a fun game.. but its not like it was revolutionary or anything, it jus' took a few good ideas from some other games and ran with it.. I really liked COD4, but now i cant play more then a few games without getting bored.. Thats how Gears Of War 2 is for me now.. Anyways, thats jus my 2cents.. If you really like the game that much then more power to you.. It jus wasnt for me.
Now, if you throw destructable enviroments, vehicles, and a duck and cover system into COD then i'm fuckin all over it..