The community in Gears 3 is actually better than it was in Gears 1. There were so many people fooling around and doing nothing (like just dancing around in circles and shooting Lancer like crazy).
Out of the thousands of rounds in Gears 3 across QM and Ranked, I can count on one hand the number of times I've seen a team fool around or trying to sabotage the match. If I had a choice, the preplanned Gladiator Gnasher battle is at least fun and a test of skill (basically 1v1s throughout the match). The ones running around in circles and doing nothing are more annoying, but sometimes funny.
But I also hate ones who join Rank and just don't play. That must be some amazing 10-minute phone call or bathroom break.