From my experience with this game I constantly see squads of guys working together leapfrogging down streets and what not. Perhaps I have just been playing on squad servers or something, but most everyone seems to be fighting in squads. Aside from the space maps...which I don't see the need for squads as much anyway.
The only thing that was slightly annoying was sometimes we would have a good squad support system going with medics and an officer and support and all and then...1 guy sees us and throws his grenade...boom everyone in the squad is dead...wow what an incentive to play as a squad when all it does is make you an easy target for nades.
Fortunately most people don't even think to use nades and just shoot back and forth. I think nades should be reduced in damage a bit more though.