Personally, I played SW:ToR from launch until 1.3 (?). I really enjoyed it the first months, played on the rare RP-PvP server because I quite like beating people up. But ever since the huge server transfer waves, the bad balance, the lack of RP options and everything it just hasn't been the same for me and I eventually quit.
Tried getting back to it recently, but it is still the same. People meet on Nar Shaddaa for cross faction RP because its the only lorewise acceptable place, you still can't emote to other faction players other than via say chat. The sitting still looks dumb as hell. So many mechanics that are not RP friendly. Its all those little things, pet peeves that add up to one gigantic wave of dislike. And thats coming from a pure Star Wars lover.
I of course also played the game for its gaming content, went through 3 storylines, of which one was exceptionally good and the other two were garbage; and I don't really feel like going through another since it will still be the same planets+the same planet storylines over and over.