Well KOTOR 2 didn't so much end as stop, and it turned Reven from the Fallen Knigh a la Conrad's Heart of Darkness into a sort of Dark Side messiah figure who basically orchastrated the whole war.
KOTOR 1 went to great pains to present Reven as this honourable Jedi who was brash and ultimately corrupted by the brutality of the Mandalorian War, which KOTOR 2 completely undercut. Not to mention, KOTOR 2's graphical design was much less original (the bad guy's ship is just another SD, and they fly around in slightly retro Lambda-Shuttles), and the characters were much more two dimensional and "standard Star Wars". Kreia was particularly badly realised, and was obviously the final "boss" from pretty much the prologue onwards. As a mentor she was wretched, and her utilitarian philosophy was transparently a cover for a Dark-Side agenda.
Then there are other issues, like the Dantooine militia bods inexplicably turning up on Telos station (how did they get there before you? How come they've gone from farmers to elite commandos?).... The list is pretty long.
The crafting system means that beyond level ten you never need to visit a store....
I could go on all day.
KOTOR 2 is inferior in almost every way, about the only thing it surpasses KOTOR 1 in is Force powers, lightsaber combat, and weapon upgrades.
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