My biggest gripe with the App Store (both iOS and Mac App Stores) is that you can't sort what you see by downloads, ratings, or other metrics. There's no granularity with the way the user sifts through the App Store, just what Apple deems to be the "Top ___" with whatever secret sauce algorithm they use. The current method of app discovery is great for the average user, but for a power user/developer like myself it leaves much to be desired.