I haven't read this one, but my alarms are going off for four reasons:
1) It was published in 1989.
2) It apparently lacks scholarly apparatus.
3) He was a student of Dumezil, and apparently his theories permeate the book.
4) He's banging the "Proto-Indo-European" drum really hard, and a lot of the PIE theorizing is speculative, at best, and Campbellian reductionism at worst.
I've recommended this before, but William Doty's
Mythography is the best single-volume breakdown of the various schools o mythological thought, discussing the strengths and weaknesses of each approach.