This goes to show one of the big problems with app stores. Apple wants to have a bunch of apps that all have 5 star reviews, so you think everyone using an iPhone is happy and that all the apps are Just Great. You joined a club when buying an iPhone and everyone here is just so happy and would never ever think of leaving! Since they control the OS and manually approve every app, they can make sure that the apps go out of their way to encourage people to think the club is perfect. The fact that 99% of reviews are completely misleading is a problem for another day. (They probably filter out reviews like "1 star: asks me 3 times a day if I like the app." Amazon sure does. I have posted a number of thoughtful 1 star reviews on Amazon for completely flawed products, including objective data showing the flaws... and they just got removed instantly. Conflict of interest up the wazoo.)
Somehow I don't think this model would work too well if there were a competing app store with honest reviews.
(Not that I think you can ever have honest reviews. Everything about reviews, not only in the mobile app category, is basically completely flawed.)
OR Apple wants to improve user experience by requiring developers to use something that respects the “don’t bother me” answer. Apple is not the best, but not everything is a conspiracy