"This is a similar problem to the ratings of religious books on Amazon and similar sites. Appeal to a very narrow niche, disappeal to anyone else, satisfy that

"This is a similar problem to the ratings of religious books on Amazon and similar sites. Appeal to a very narrow niche, disappeal to anyone else, satisfy that niche, and your percentage ratings will be very high (even though almost all customers know, correctly, that they dislike your product)." That makes the ratings more useful, I think. The rating is only really interesting to those who don't know if they'll like a book, and those are the people in the niche.