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: Colonel Macklin, Roland Croninger, the Man with the Scarlet Eye (literally). Macklin redeems himself in the end, however.
High Octane Nightmare Fuel: Oh so very, very much. McCammon does not pull any punches with his descriptions of anything, including hacked-apart murder victims, the effects of radiation, and a lot of lingering on the smell of decay.
Purity Sue: Swan. Gets a bit old near the end of the book.
Squick: So much squick, especially the descriptions about people who died in the explosion or were later murdered.