I like Johnson's books--they are good vehicles for the lay person to navigate the complexities of archetypal psychology. This book presents a psycholotgical/cultural interpretation of the Dionysus muths in a simple, direct, and usually-insightful manner.
The author sometimes uses too-broad strokes, trotting out wild generalizations about cultural phenomena that seem a little too superficial, a little too pat to be wholly convincing.
Also, if you are looking for a *practical* book, this probably isn't it. The chapter on using the Dionysus myth in your own life is woefully thin, which the author admits right off the bat. In fact, he refers you to his earlier book, Inner Works, for a more detailed, specific method of practical applications. That said, Johnson's thin volumes (this one is about 90 pages), really need to be read and used in conjunction with that book.