Well I enjoyed the first game more... mostly because it's actually finished... and the combat isn't broken... it's a good game, no doubt, but not a great one... the second one had the chance to be, and it was cocked up by a rushed development that left it unfinished... and if it was given that extra time, I think I could say that it's be the better game... the more personal plot, that focused on change, growth and facing your past, was so unbelievably compelling... at first anyway, the ending sucked and everyone knows it, and the plot just sort of became less and less focused as time went on... with character arcs never finishing and lots of other plot threads that never went anywhere, regardless of how well written the characters were... but of course the thing that Kotor 2 does so well, is it's pretensions to grey morality, creating a stark contrast between, what your companions thought was the right thing to do, and what the jedi code tells you to do... never landing on a true right or wrong, and essentially making the dark side light side points, well pointless... which is the best thing you can do in that situation...
Honestly though, I think the biggest downfall of Kotor 2 is how over ambitious it is, especially with trying to take the series in a new direction... with the way it handled it's writing, it's characters, it's player choice, morality... and especially it's role playing, which is something that I didn't mention, but even though it's very underdeveloped, it's a very interesting way they handled revealing character back story, you know, actually giving you a very complex one, and it does a great job with playing into the themes of the story...
So, yeah... while Kotor 2 isn't exactly a "good" game... it had way more going for it than the first, which was cocked up by a rushed development... but I think the best thing you can say about it Kotor 2 is that it's greater than the sum of it's parts...<.<