I think we have all come across some anonymous reviewers who seem to over the top with their reviews. The problem is that today many of us read reviews from unknown people to decide what books to read, what movies to see, where we stay on holidays and what resturants to try.
There is a good chance that many of these glowing or disarster reviews aren't authentic. Today many offer to write such reviews for marketing. Here are some that I pulled out of one such site, fiverr where people advertise their services for such things.