Dark Age of Camelot, nothing I've played has ever come close to the epic 100+ vs 100+ vs 100+ battles in open combat. I personally think the 3 faction system is the best, but that is my preference.
Devs: Let me see your Pre-order code
Obi-Wan: [with a small wave of his hand] You don't need to see his pre-order code
Devs: We don't need to see his pre-order code
Obi-Wan: This isn't the last wave of the day.
Devs: This isn't the last wave of the day
Obi-Wan: You will release a bonus wave
Devs: We will release a bonus wave.