I can hear people behind me (and I also turned up my field of view, which always felt weirdly narrow by default). What is your sound set to? Mine is on "war tapes" and I have a G35 headset with surround sound. Maybe it's something about that...
Defusing bombs is hard at times because if people die all around it, you end up trying to pick up their kits instead of defuse, since the same key does both and it seems to prefer "what you're near" rather than "what you're looking at". Then you spend five seconds running around to get a decent angle and the thing either explodes or you get killed.
In conquest around here, everyone loves to go attack points, but nobody has the patience to defend. We'll get 2 of the 3 points, and if we held them we would win, but everyone runs off to that last one and either get slaughtered attacking it (so we lose) or they're all busy there and the enemy take the others (so we lose). Typing in team chat seems to have little effect on the amount of people trying to overcome the enemy with human wave attacks.
Handy BC2 stuff:
http://denkirson.xanga.com/722757523/bad-company-2/ (you know, for finding the most powerful weapons, lol)