no, deferred rendering looks no different at all.
it CAN make it look different (ie lots and lots of dynamic lights for cheap!) but there is no side effect that makes it look different by default.
the bloom in BC2 is just that, stupidly overdone bloom. nothing more.
the color scheme in the game is pretty boring and on some maps you'd actually be hard pressed to spot someone just because it's THAT BRIGHT.
http://screenshot.xfire.com/s/94578894-4.jpg bloom off
http://screenshot.xfire.com/s/94729369-4.jpg bloom on
DUMB either way, it's just bad art direction.
i think Crysis actually did a really good job. it had a ton of the usual suspects but managed to never overdo anything, instead it looked fucking good instead of washed out shit or blurry / greasy whatever.
Have you adjusted the brightness in the game? If turn it down a ways and it doesn't look like that.