The only MMO ever worth playing, in my opinion of a gamer who has tried quite a lot of them, was Star Wars Galaxies. Not because of "storytelling" (we all know the story, we would like to make our own now, thank you very much) which was very slim, not because of combat which even then had its lackings (though it was a hundred times more entertaining than the dumbed-down WoW-style "thing" they've got now), but because of the one thing which I believe should be essential to any MMO - the ability to freely shape and express your character.
That said, I think Old Republic is going to be just another WoW clone... they even say so in the interview by "trying to bring in what other successful publishers..."
There will be no skill-based character system. So once again you are boxed in with a lousy bounty-hunter, or a Jedi, or a Sith or whatever. Heavens forbid you should have a Sith Bountyhunter. Or a force-sensitive gambler. Or anything that does not fit into the archetypal segregation of character classes.
My absolutely BEST roleplaying experience was the Mos Eisley cantina evenings on Europe-Chimaera servers in SWG, prior to the debacle known as NGE. I didn't do any quests. Or grinded for that new piece of armor (oh yeah, did I mention that knowing a good craftsman could actually get you THE best equipment for free, because players actually made everything in the game except the most basic gear). I drank the drinks, talked the talk and walked the walk with the rest of the galactic scum, mingled with unlikely heroes, got shaken down by arrogant stormtroopers (we ambushed them later in an alley), and into a fist-fight with a cocky human who thought he could take on a Trandoshan hunter like me. And then got beat up in turn by his master.
All content by the players, for the players.
In an MMO, I don't need a "rich story". I need an open world, with solid background and the freedom to express myself through my character. That's the ONLY thing a MMO can have better compared to single player games. Sadly, game developers seem to ignore this fact and cater to the grinder kiddie crowd. I guess it nets more mula.