I'd be interested to see a grouping of all the apps I have installed by current app store rating (Or a broader study of multiple people's devices and their "Average star rating"). Of course this data probably wouldn't mean much until it was weighted by usage, but even that is hard to quantify "use" there are apps I used that more or less "have" to use and apps that I don't need to and/or rarely use that might skew the results.

Edit:

Hmm, I'm jailbroken, I wonder how hard it would be to get a list of installed apps by SSH'ing in and then combine that list with this endpoint (No affliation with app, found link on stack overflow) https://itunes.apple.com/lookup?id=422876559 to get the ratings....