I really liked reading Maze of Peril! Keep in mind I have a major thing for Zenopus's Tower, the sample dungeon which Holmes wrote for the Blue Box. But that only covers about the first quarter of the book, and is so different that it's hardly a writeup of Holmes' adventures (he ran it for his sons, which as the dad of a 6-year-old I totally dig).
Still, I think it's an enjoyable read - free of pretense, short, and with a number of interesting situations. Holmes also seems to have been an interesting guy - http://en.wikipedia.org/wiki/John_Eric_Holmes. I guess I prefer people who insist on their Dr. title to people who use pseudonyms to keep their gaming work separate from their professional reputations, although I agree both are dodgy.
I'm also greatly enjoying Quag Keep, which lots of people think is terrible, and I dug the early-80s RPG-turns-real setup of Joel Rosenberg's Guardians of the Flame, so I think I'm inclined to think highly of novels that offer a perspective on how roleplaying used to be.