I just wish that you could get a "Sith Lightsaber" in the sequel. I loved going to the Sith Academy and earning my unique, personal weapon by completing all the tasks and proving myself. Although it doesn't compliment the KotOR ii storyline, I wish you could also take on the roll of either Scoundrel, Scout or Soldier again.
The only thing that i dislike about KotOR ii, in comparison to the first, is how your character moved while carrying weapons. I liked in KotOR how he kept in low, by your side - as you would if you were wielding a stick of energy, or any sharp instrument for that matter - instead of running with it whiring past your face. I also liked the way your character attacked in KotOR, with reference to the way he/she executed a flurry for example. It just looked cooler.