lol, an MMOFPS would be quite useless since all you do is just kill ppl, not interact and stuff so whats the point of having a massive server to connect a 1000 ppl when you dont' interact at all, all you do is aim and shoot
Tribes and PlanetSide, More so planetside because it has RPG aspects in that one and it has a monly cost. you collect and earn points.
Tribes lets over 100 ppl play in a server for a game. not sure how planetside works whether everyone plays in one main server or split off. but tons of people play together.
and usually in thoes times theres not much of a DM mode in em. so just killing people isnt the goal.