Demon Hunters is a great read on many levels. First, and the most obvious, is the friendly, tongue-in-cheek writing style. It feels like I'm sitting at the table with the author(s) and we're chatting about the game. It sets the tone for the game and explains things wonderfully.
The book is organized incredibly well. The first couple of chapters give an overview of the campaign world and rules without going too deep into things, leaving that up to the chapters dedicated to those things.
Overall this is the best RPG that I've read since Dresden Files.
[5 of 5 Stars!]