In the KotOR setting non-Jedi enemies have certain things that can be used against Jedi due to them being far more prevalent at the time. There would also be differing levels of Jedi, from very low-level Jedi to rather strong ones. I really do hope that the force potential of your character is something that is tied into the class. If you are a smuggler or trader or a fighter pilot - y'know, someone who doesn't need force potential then perhaps you could have some kind of low-level latent ability at best, like early Corran Horn type "potential". ie: you're a bit luckier than most and have better reflexes etc, but that is about it.
If you are a dedicated Jedi-type class then you will be stronger, but perhaps you'll have certain responsibilities in the game. I would go as far as to say that at least on certain servers there should be enforced Jedi-Sith PvP and if you want to play a blue character then you can't have force talents. That would give a certain sense of responsibility with the force talents you are given. I would also hope that there would just be different types of Jedi abilities to choose from instead of rigid Jedi classes. You'd have your different saber skills as one area, mind manipulation, physical manipulation, self-restorative powers, that sort of thing. I guess I am just wanting a game where kind of like the Jedi Knight type games you would have to choose which skills to improve as you levelled, and you'd only have a certain pool of those points so you would have to choose whether you specialised in say, saber duelling, meditative skills that lift your performance in general tasks like piloting and such, lightning and choking bitches, or you could just level up across the board and be really mediocre at everything.
Oh also, generally with this kind of game it would be nice if they could give a neutral faction. Like, lessay in a KotOR setting game you could have Jedi-affiliated forces, Sith-affiliated forces, then a bunch of non-affiliated people who are traders and such or just people trying to make a living on some unimportant backwater planet. There would be no PvP honour involved in killing the neutral faction unless they are the ones to start shit. So sure, the Sith could attack your ship/planet, but why? You have nothing of real value!