Originally posted by Quizzical
But now I think I've got my answer: the game is meant to be a Shiny New Thing for people who are perpetually moving from one game to another, always pursuing the Next Big Thing. And Aion will have the budget and the polish to do that very well, probably selling impressive numbers of boxes early on. Of course, no game can remain the Shiny New Thing for long, so most of those players will move on pretty quickly, when the next big blockbuster comes out.
That doesn't mean that Aion will die or be a commercial failure. It will probably retain a sizeable playerbase, especially in Korea, relying largely on attracting players who haven't played the various games that it borrows heavily from, much the way that WoW does.
But a game where the point of the game doesn't involve game mechanics is not for me.
Anyway, thanks for the replies.
That is exactly it, I think.
It's the shiny new thing. And if Aion manages to do that better than all the other ones who are still in development, or recently released, then that is reason enough to choose this game instead of the others. This is the answer to your question why one should choose this game.
If you are really looking for a game that adds a new game mechanic, then this may indeed not be for you.