And that's really the great crime here. The best part of KOTOR I were the sequences that described Revan and his accomplishments. The man saved the galaxy and was worshipped even by the people he destroyed. You really got some sense of awe from him.
Then you became him.
Except you didn't, really. After that little revelation, you're not the manipulator or strategist Revan is. You're never allowed to display that savage cunning he's rumoured to possess. You're meant to be the great man, but no matter what path you take, it's either Bastilla or Jolee who call the shots. How can you really *be* Lord Revan when you've been treated like a child the entire game, even unto the end?
KOTOR II vindicated Revan, made him much more complex than we previously saw. He had a purpose to his fall which went far beyond the black and white villain crap Bioware gave us. Revan went beyond the stereotypes associated with the Light Side and the Dark Side; he controlled them to meet his goals, not the other way around. Like Kreia says, Revan is power, and KOTOR I didn't do enough to show this. Playing KOTOR II and listening to what the NPCs had to say of Revan made you look back and think, "Good God, I was a bad ass," which should have been Bioware's objective. They didn't do very well.
On the side, for one who really looks at the dialogue in KOTOR II, you may notice that Obsidian takes quite a few subtle pot shots at the simplicity in the original. From HK's dialogue to the direction of the game itself, it seems like somebody thought Bioware's efforts were quite lacking. I think that's precious.