The handling of the Venom suit in general is just really creepy and nasty and unpleasant. By this point Paolini is basically just treating it like a cool power-up/weapon, while completely ignoring how horrible it actually comes across. He even said the book was supposed to be about bodily autonomy, and yet this thing has violated Kiragon's entire being and she doesn't even seem to notice or care beyond a brief bit of whining before she just gets over it.

And the way characters the author doesn't like are tortured and killed off is really mean-spirited and cruel, even more so than in his previous efforts. What happened to Dr Carr just came off as really unnecessarily vindictive and sadistic.