This annoyed the fuck out of me when I first played, then I adopted Shamal's attitude and enjoyed the game much more.
In milsims/filmsims etc, you'll get a much higher standard of play, but not necessarily much squad work; that tends to come with teams. I've played with a couple of teams that have rolled up the opposition all day long, and it's still been a good game.
What milsims and the like do though is increase comms a lot. That tends to get you into squad work territory, and squads will work within them. Spot one and join in if you can.
In airsoft, basic leadership and direction will often win. Well lead fireteams are a miracle.
Most games I play are filmsim and I use an LMG. Mrs TPH acts as my rifleperson. Obviously, we know how to communicate between each other! We play as a team of two within a main team of however many. We attach ourselves to players that we know have a clue as a squad. Good game pretty much guaranteed.