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.
YMMV: The Saga of the Noble Dead
Complete Monster: There are a lot of shades of grey in this series, but among them are Darmouth and Ubad who truly stand out as evil.
Moral Event Horizon: Welstiel was always somewhat sympathetic compared to the other villains- but then he just had to attack a monastary, kill the monks, turn them into vampires, and then forcibly isolate them during their transition so that the devolved into near-mindless ferals, and then fed them their own former brethren who remained alive. Even Chane was bothered by it.
Nightmare Fuel: Ubad in general, particularly the curse one of his minions puts on the lord who slighted him (well, technically he killed him, but that's just an inconvenience when you're boss is the world's best necromancer...)
Uncanny Valley: Magiere gets this a lot from ordinary living people. Some vampires do as well, though others are particularly good at concealing it.