Reviews have been across many consumer product lines. Not books per se. The breadth and depth of consistency in the writing is astonishing. From five stars all the way down to one. On one product. I don’t think I should be posting links to Amazon product reviews here on FR so I won’t do that. But examples abound on the Amazon website if you look around.
I would like to see the link, and if you think it is very representative and useful for your thread, I don’t think the mods care.
My impression is that as long as it is sincere, and they trust your motives, linking to something like that, is OK.
If they’re being fixed by writers, or fake reviews, the value of all their reviews will plunge into the negative.