Dex is defense+Lightsaber to hit+Couple random skills+Reflex+Blaster Damage and hit
Strength is Lightsaber to Hit (It picks between dex and str for the higher one), Lightsaber damage, Vibro everything
Con is Fort+Health gain+One more thing IIRC It's actually not that great in KotOR1 either but in 2 it's the best stat IIRC.
Wis is Will+Force powers+Couple skills
Int is Skill points per level+a bunch of skills
Cha is the main skill in the game and using dark/light force powers when not of that side.
Dex kinda beats everything to death for some reason.
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Whatever...