I don't understand why almost every app in the Play store have at least four stars.
I believe the average product rating on Amazon is 4.6 stars? Then you read the 4+ Star reviews, and realize that people have given that rating to products they have ordered but not received, products that broke on first use, products that don't do what was claimed at all, etc.
That is when I realized: a great many of the reviews are really only useful as an abbreviated IQ test of the reviewer.