As a DM, I absolutely adore the monsters in the book, especially the multi-page deep dives into common/popular types of undeath like Vampires, Liches, and Graveknights. I ran the attached adventure for my players, and they all enjoyed it, it was a nice distraction from our real game when we had to take a short hiatus.
If I had any one issue with the book, it's that the Lich/Vampire/Ghost archetypes don't live up to expectations, but that's counterbalanced by the Ghoul, Zombie, and Skeleton options going above and beyond, with the Ghoul Archetype in particular being one of my favourite parts of the entire book.
