I got "the grouper" and it implied I'm a master of multiplayer.
Aside from playing Left 4 Dead, Gears 2 Horde and ODST Firefight with the same group of people, the only multiplayer I dip into is Bioshock 2, and that hasn't been for months.
Me thinks this quiz needed a bit more work, especially since there were too many questions that relied on recently released titles (we can't all have played EVERYTHING) and others that didn't match any of my feelings (for example, never played The Sims, so how would I know if I like it or not?).