I've been saying this for months, but personally the main problem I see with both KOTOR games (setting aside all technical or implementation problems) is that both MC's start out as Jedi. Yes Revan lost his memory but that doesnt really count.
In the Star Wars universe, Jedi are the ultimate power, far above and beyond anyone else ultimately. Therefore, since the MC is already a Jedi, the only path for character improvement is Ultra, Super God-Jedi (!!!), leading to the power problems noted by many on these fora.
Alternatively, I suggest one of two directions.
I. The character is a latent force sensitive who as a child has to compete in some sort of task to be accepted as a Jedi Padawan. Could also serve as a tutorial. Following this, the game diverges into two paths: you either pass or fail.
In the first, you play a series of small vignettes of Jedi training, giving the impression of the passage of time and acquiring of knowledge through the aging etc of your character model. Also gives a more indepth understanding of force/light saber rules for game.
In the second, I see several possible models.
A. You join a different force tradition.
B. You are discovered by a Sith, attracted by your hate and anger towards the Jedi.
C. You somehow infiltrate the Jedi organization and pretend to be an apprentice
1. Eliminate one of successful Padawans and assume identity.
2. Have a parent bribe someone.
II. The character begins as a member of another force tradition, preferably one having some sort of philosophical disagreement with the Jedi teachings. Somehow, a Jedi enters the situation and you must decide between the different philosophies. The degree to which you do so (or dont) affects the future path. Also, in this instance, an organization rating would be added, which noted your standing within certain organizations based upon your actions for them or how closely their ideas resemble your own.