This is an enjoyable read with a lot of great information in it. The author's biggest problem is a lack of organization. The whole thing feels scattered, as though the author didn't bother to outline the ideas he wanted to convey before putting pen to paper. Sometimes Matthews repeats himself. Other times he throws out a term and doesn't both defining/explaining it until over a hundred pages later. The dream/meditation bits at the end of each chapter and the ritual scripts fall a little short if they are in fact an attempt to make this more of a spiritual text.
Chesca Potter's afterword about the Green Woman feels hastily written, but has ideas that could be developed into a whole other book, or at least a couple of more chapters of this book.
The ideas are all here. It's up to the reader to dig them out.