It looks like shepherd.com is a book review site that doesn't have any reviews, just ratings. It links to Amazon.

Is this really the sort of content Google should be returning?

Edit: it seems I missed the link to the actual book reviews because the link text is uninformative: "Chosen by 1 person - see why." (Sometimes it goes to reviews, sometimes not.)

And the word "review" never appears on the pages that have reviews. Seems like bad SEO?

If you're looking for book reviews, here's a website with some pretty great reviews: https://www.thepsmiths.com/ (Content warning: the authors are conservative.)