These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Complete Monster: The Emperor. He drained all life from a planet into himself, leaving it as a hole in the Force. And he plans to do it again.
Fridge Brilliance: When Revan is trapped in a state between life and death, and fed upon by the emperor? This is what Malak did to captive Jedi on the Star Forge in KOTOR 1. How else would Revan know what's going on, and be able to subtly resist and counter it?
Lord Scourge crosses this when he murders Meetra Surik, the Jedi Exile, just because he had one lousy vision telling him that they would fail against the Emperor. While he does later help the Hero of Tython, it could easily be argued that he is only doing this out of self-preservation.
The Woobie: Up to Eleven with Revan and the Exile. Let's start with Revan: in addition to everything he suffered through in Knights of the Old Republic and the events before that, here, he gets a grand-total of two years to be with the woman he loves before having to leave her behind forever, never gets to see his son, is held prisoner for three years, drugged up the whole time, and finally gets betrayed and held captive for 300 years by the SithEmperor.
And now for the Exile. Like Revan, she did terrible things and even after making up for them is still stated as being viewed as Reformed, but Rejected by many in the galaxy, had to live as an Exile stripped from the Force for years, went through all the crap KOTOR II threw her way, and finally Gets killed by Lourd Scourge
Iron Woobie: Both of them deal with all of this with minimal tears, which shows their Determinator status pretty well.
What Happened to the Mouse?: While Jolee, Juhani, Mission, and Zaalbar are all handwaved out of the plot in a single page, Carth doesn't even get a throwaway mention (sure, he can be pretty hostile if Revan isn't female, but...) More notably, the Exile never once thinks about any of her companions, and nobody from the sequel gets a mention except a vague reference to "Darth Traya".