I really enjoyed this game, too. I found it pretty difficult on every play through, after the first part of the first one, when I realized I could save my exp. and gain more jedi levels, but once I got there it was cake with extra icing.
The duels side quest was particularly difficult, but the right buffs and grenades helped a lot.
I can't remember the kind of jedi I chose, but it was the one that got the most force powers and force points. At high levels, not much could save against whatever he threw at them, and he could use dark side abilities, like life leech, with penalty and still have plenty of force power in reserve... not to mention getting to max out so many useful force powers full skill trees, and a fast force power recharge rate.
This is a game I miss. Not surprising, as it was made by bioware, and built on the same engine as Neverwinter Nights (D&D 3.0), which I played many years prior and loved more than any other game, ever. The game was great out of the box, but it had a magical community that created some very incredible mods. With all the downloadable content it was hands down the best RPG video game I've ever played. Once the mod that added all the 3.x prestige classes and/or templates (even Demilich!!), and the community started putting out some Epic level campaigns it was an entirely new game over and over again.
Edit to add... One thing I would complain about is that the really high level equipment seemed to favor specific builds, meaning to really max out a really strong force power build, to include the ability to wear the +5 wis/dex robes, once had to be light side, and to get to use the cool warrior enhancements one had to lean dark. I actually played this through an iphone app, so I didn't have access to cool community mods like NWN, but I bet it was the absolute bomb on PC.
RE: Revisiting A Classic: "Star Wars: Knights of the Old Republic" (2003) - Part 1 of 10 - Endar Spine