This was a bit of a "Ho-Hum", Campbell's theories of Mono-myth and cross-cultural contamination; the great spiritual truths of our age, etc, etc. While he did a formidable amount of scholarship on these things and I no doubt have been brought to it time and time again via other sources, which made this - well, the ideas were not "fresh" to me shall we say.
And while clearly I'm not in a position to anyways criticize or critique him this one will be heading back to the bookstore soon.
If you want to read a great book on Fairy Tales and the symbolism contained therein, try Bruno Bettelheim's "The Uses of Enchantment".