We are very lucky if we are using the Windows 10 (Mobile or not) Store. This Store is bad with a lot of problems and wrong and time and excessive bandwidth consumption, but is incredibly better than the 8 and 8.1 ones.
In a podcast I do (in Spanish) I got an incredible ten minutes of RFLMAO when showing the "virtues" of the Windows 8 store. Was a very epic moment. Even the other participants in the podcast couldn't stop of laugh...
Well, really all of us must cry because so bad and wrong programs goes to production. As said, current versions of Windows App Store is slow, sometimes does not work and very frequently fails to update the programs. It's a general problem, and as it comes from final customers and not from Big Accounts, Microsoft does nothing to resolve those issues.
(Yes, yes, I only talk about problems with Windows, not its virtues, that of course have... in the Desktop. But for Cloud and Tablet or "Sof?", it sucks).