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This is about any RvR system from GW 2, DAOC, ESO, or the upcoming Camelot Unchained if done the same way etc. I'll explain why I think this and what system would feel more complete to me.
The reason it is incomplete is because of the faction/realm lock. While some people would cite realm pride or loyalty I would have much more of either in something if it was my guild that I was fighting for. This can be done by having guilds build cities/towns and able to war or ally with other guilds forming alliances, having neighbours, and actual friends or enemies that you get to pick and are not presented to you by the game. See EVE or Shadowbane for the basic premise.