MW2:
Pros
-Callsign title and emblems add a cool amount of personalization to the game.
-Killstreaks (when not being exploited) are a nice reward for doing a lot of the work.
-Huge amount of weapon attachments, camos, and perks to choose from.
-Lots of replay value, 10 prestiges!
Cons
-spawn kills
-a lot of hacks and glitchs make the game unfun (models, knife monkeys, unlimited killstreaks), although they get fixed it still is annoying that people keep finding ways to cheat.
-killstreaks can be overpowered when a team uses a bunch at one time.
-level designs are bad on some of the levels.
-servers suck, they couldn't have made it any harder to invite a group of friends to play with you without some of them constatnly being kicked and then having to rejoin the lobby again.
-no party chat
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BF:BC2:
Pros
-destructible enviornments
-teamwork is emphasized in multiplayer
-based on demo it looks like glitchs and stuff are less likely to occur (we will have to wait and see when the game comes out though).
-good levels
-squad system is great when playing with friends.
-more bolt action snipers than semi auto (hell yeah!)
-squad spawns mean no spawn deaths!
-vehicles are balanced
-dedicated servers (we will see when the game comes out too)
-dogtags for knife kills
-no killstreaks
Cons
-graphics don't seem as good.
-not as many weapons
-no callsigns
-no killstreaks
-no prestige only goes to 50 which sounds like you will finish it fast
This is my .2 cents on the huge subject. It may very from a different persons perspective.
Thank you,
-Whitehawk