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.
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?
Internet Backdraft: Quite a few KOTOR fans hate this book- alongside putting Revan and The Exile to mild Badass Decay, the KOTOR squadmates are incredibly shafted, outside of Canderous, T3 and Bastila. Even more so for the KOTOR 2 squadmates, where outside of Kreia (And only as a reference to her as "Darth Traya") none of them are even mentioned by name. Add this in with Exile not recognising Force comsuming abilities (Despite having fought one in the form of Nihlus), her connection to the Force magically re-appearing, the Sith Emperor being a Villain Sue and all of Kreia's teachings about the Force and the Jedi? Clearly a sign of Dark Side corruption.And on top of that, quite a few people hate the name Meetra Surik. Quite a few people used this as an example of why the below-mentioned Reboot wasn't completely a horrific decision.
Fanon Discontinuity: Even before the 2014 reboot, many Star Wars fans refused to believe this happened, and use other explanations for why Revan is in The Old Republic.
Mary Sue: Overly consciously averted with Revan, where he will act like he has barely any tactical understanding (Despite being a tactical genius during the two wars he fought in), will avoid using any of his powers from the game because that would be "overpowered", and will fall for obvious traps. Drew also drops a big Take That to anyone who expected a competent Revan, but then plays it boringly straight with the Emperor- see below.
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.
Villain Sue: The Emperor. As a teenager he killed fifty Sith Lords at once, a feat more suited to a Dragon Ball Z villain than a Star Wars character, he can feed on an entire planet at once, and has all of the powers of KOTOR 2 Big Bad Darth Nihlus but at a greater level and without any weakness (also making him a Copy Cat Sue) and as soon as he shows up, Revan ceases to be the focus character or move the plot along at all. Oh and he casually stuffs Exile into the fridge. Because he's just so awesome. He doesn't have much personality beyond being powerful and evil, but look how awesome is he is.
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".