Appalling.
Even as SciFi, the premise is not enough for a full length book.

But as a misogynist and colonialist novel, it takes many sexust myths for granted and enthusiastically supports the theft, by the United States using heavily armed force, of artifacts from Greece.

Defenders only have the excuse that it's a few decades old and that's how "we" thought, are refuted by characters in the book who opposed this, showing that people in those times objected to the bigotry, so people could have known better, but the author portrays them as obviously foolish for rejecting male and US superiority.