Interesting article on Salon today about the overall shape of Amazon reviews suggests that the more the horizontal star-rating graph looks like boobs, the more reliable the ratings are – with more five and one stars and fewer threes. That kind of goes along with my intuition that the more a book that reaches a broader audience the more likely it is to have a wider range of reactions.
I guess that’s common sense, but on the other hand, if you’re looking at a straight genre book this doesn’t hold up. Romance readers know a good romance book and only romance readers are likely to review romance books. In cases like that, you want to see a lot of fours and fives, no curves.