A great example of the problem of even reading Amazon reviews: I was looking for a translation of the Analects by Confucius (more correctly, Lunyu by Kongzi).
A well-respected translation was criticized by at least one Amazon reviewer for its commentary, which veered off-topic, included the editor's own ideas, etc. I ruled out that translation.
Then I read a scholarly review of the translations (found via Google Scholar) and learned that such commentary is the proper way and that it's been done that way for centuries or more. The editor is meant to interact with the Kongzi's text.
If I didn't read the scholarly review, I would have believed the Amazon reviewer. It was a lesson to me - one I finally accepted: No matter how smart you think you are, unless you have expertise in a field then you lack the ability to discern the truth from ignorance. Persuasiveness is not a measure of truth. You're a sucker, a mark, if you think otherwise.
I no longer read Amazon reviews for such purposes and don't trust Wikipedia either. Also, note that reading the Amazon review actually hurt me; bad information is worse than no information.