I never made it a habit to say GG at the end of every game. In the game that I played before joining Guns of Icarus, GG was a rare occurance, because instead of saying it, people just socialized, balanced or not. In fact, I used to say that in the beginning of the game start through a voice commands, but only in game modes where you had to win as an individual.
In Guns of Icarus I either say "Mobula OP" or nothing at all. When I say nothing at all, there is a good chance that I don't pay attention to the chat, which happens often in a competitive environment, I just blend it out the second the game starts until we are back in the lobby.
I would rather have some socializing instead of dem Gs, but in competitive teams tend to be so socially seperated that one cannot do more than compliment gunners or pilots or trying to point out flaws in the other teams gameplay. I don't compliment very often, because said gunners or pilots sometimes do so many mistakes that I am not sure how much good a compliment would do and as a pilot myself I know how much unintended stuff happens, for example the crew doesn't do what I want immediately or I am in such an awkward position that I don't even know, and I am not sure if I would even want a compliment when I am on the recieving end.