Attempts to cover an immense amount of material in an organized fashion but ends up being a bit overwhelming. Also takes as given connections between Celtic beliefs and shamanism that are not undisputed. ( )

Fairly well researched for a brief overview, but not well written. In other words, it's too dense to serve as a good popularization, but not sophisticated enough to be really good academic work. I'd put it on par with an acceptable thesis in the field. ( )