To a certain extent this reminds me of my experiences with Tribes, which was a FPS in the late 90s which was unique because its multiplayer was designed around very large team based competition. IIRC it supported 128 players per map but 64 was more common, and this was at a time when 8 to 16 player multiplayer matches were the norm for PC FPS. Tribes was brilliant if you played between two clans and absolute trash as a pick-up game, primarily because the game required cooperation and coordination to be successful; and this is almost impossible to achieve unless you’re playing with a team that was fully formed ahead of time and have played together in the past.
I have a feeling that 1 year from now there will be a dedicated following for MAG who believe that it is one of the greatest games ever, and a very large group of people who played it and thought that the massive mob of morons made the game nearly unplayable.