Well, MMOs are just like any other game. Some may like the game itself, but it happens to be an MMO. The only reason i played XI, was due to the Final fantasy brand. I was a fan of the genre, RPGs and XI just so happens to be online.
Massively multiplayer online game does not mean you have to play with others. In most MMOs, you start off the game with who? Pretty much you and your lonesome, you can play alone, just like any other multiplayer game, such a Marvel Ultimate Alliance, Tekken Tag Tournament or Gauntlet, etc. You can play/beat those games alone, but the multiplayer aspect is merely an option.
In VO, multiplayer should be an option, akin to DCUO. In DCUO, you can solo your gear tiers, slowly, but it can be done. Multiplayer is just faster, but of course you need players for raids.