Well, I didn't see a thread like this, so I guess I'll make one. Please start by posting different nominees that I should put in the poll so I don't leave any good ones out. I have room for 2 more MMO's.
Here are the ones I came up with:
Guild Wars
WoW
Star Wars Galaxies
Necron
Runescape
Here are the ones I came up with:
Guild Wars
WoW
Star Wars Galaxies
Necron
Runescape