Swan Song (novel)/YMMV

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.