I'm a well read grad student who's bluntly honest about all things, although I try to be most honest about myself.
First of all, the art is spectacular, which is huge; without good art, anything else will not save an art book. I find some art books have spectacular art, without good organization or too much text. I prefer an art book to let the art speak for itself, at least to a good degree, and a book about art is the place to talk about the artists and context of the art more.
This book had really good organization, although not, by any means, the one way to organize it. They collected prominent artists and built collections showcasing their art, then had brief interviews with each artist, including asking what their favorite piece of Darkness art was. (A clever way to add in more art, as they featured the piece the artist brought up.) I also found the questions and answers to be brief enough and interesting enough that it didn't take away from the spotlight on the art, so I found the text less annoying than I do in many art books.