NEOTOKYOo (the last o should be hanging up there) Isn't realistic, yes. BUT! It is very and I mean VEEERY squad-play centric. Constant communication between people is a must. Especially from the ghost carrier. A carrier with his/her head screwed on right, a working mic and someone able to take simple directions can decimate the enemy forces.
One of the most wildly used tactics other than "calling out" enemies and having your team take care of them, is baiting. People don't know they're doing it, but they are. When someone picks up a ghost, they are immediately the target of attention by every player in the map. Usually, the enemies will try their best to take care of the ghost carrier. Now, people tend to use this, while enemies have their attention on the carrier, some people sneak around the enemies and hit em from behind. The carrier unknowingly becomes the bait in an unplanned trap, that sometimes works, sometimes don't.
It was at the beginning of my gaming addictions that I realized suppressive fire rarely, if ever, worked. And one simple tactic seems to have escaped the 101 Edition of their "Digital Battlefield Survival Guide". n What the players don't do, is not doing a damn thing. Players are geared to act. Ready-Fire! You just go. Though, yes, it works, I'll give that, but it usually ends up with the player staring at the spawn screen after killing 2 or so other players. This is very important when it comes to flanking or when you try to sneak past the enemies and your friend just spawned on you and "Oh look! Enemies!" Some people also have trouble sitting tight in a hole, to wait for the enemies to go away and leave a flag and/or some vehicles unguarded.