Well, the Old Republic was full of Jedi ( and Sith ). I'm certain all of those were heroes ( and villains - debateable ), to say nothing of all the soldiers, and probably a lot of smugglers and pilots and, well, you get the idea. Now, I don't know what the story is going to look like in The Old Republic, but the only time I feel what you say is true at all, is when it comes to killing some named enemy. Obviously, not everyone can be part of that.
Now, I like RP in my MMOs, too. And I think it's a hallmark of a good RPer to be able to write their character into the story, so to speak, without giving them undue credit.
Anyway, Inkidu, you may not be able to enjoy the story of any MMO on an emotional level, but I do think you're wrong to imply that others can't either.
But then again, I prefer RP. I don't care that much about equipment or achievements or raids or whatever.
Also, on a slightly related note. I have heard rumors and I've been seeing hints in interviews and such that The Old Republic will have romance subplots. The very idea of companion romance in a fricking MMO seems insane to me. In a good way. Mainly because Visas Marr from KotOR2 was nearly as awesome as Isabela of DA2. But all that aside, I don't suppose anyone knows more about that? Or the number of companions you'll be allowed to choose from? I mean, considering it's an MMO, the selection ought to be vast, so that everyone isn't running around with the exact same people in their party. That'd be ... strange.