There are two things about MMORPGs that unfortunately matter.
First, it matters a lot to me whether I can play from the start. A lot of the early fun in MMORPGs is in the exploration of the game and its world. And “to go where no one has gone before” is always something that significantly increases exploration-fun for me. To explore something that is already very well documented on several internet-wikis and has been experienced by every player I encounter already is – unfortunately – less fun.
Second, to play a game that matters. A big game. This is something indies have to struggle with – unfortunately. A lot of the fun in a MMORPG comes from the feeling that you are not playing some niche game, but THE game. Of course, the time of THE game may be gone by now. Just like the time of THE weekly blockbuster is gone.
Don't call me irrational. I know I arguably am. That's why I call these things unfortunate. I would be better off if I could ignore these things. And I certainly try to do so. But at the end of the day I have to admit they unfortunately matter.