What mav said, b/c I think that one was meant to be played first of all of the stories, based on what I have seen thus far. Without going into spoilers, though, all of them at least touch on the one thing tynig SWTOR in with the kotor games, which was probably the intent as a focal point drawing all the class storylines together. That's about as far as I can go without risking spoilers. Or talking out of my arse becuse I have not played it either, only kept apprised of the whole revan thing.
"I cant see S***! --YOU GO TO HELL!" --Tourettes guy