The fact that Win 8.1 highly recommends backing up everything before installing it means that the nitwits at MS still haven't addressed the problem we've had since Win 1.x which is reinstalling and upgrading often means clean slate for the whole machine with is ridiculous.
This is still a Preview version of Windows 8.1, so I'd cut them a little slack there. Once the actual consumer version come out I'd expect them to have that issue addressed.
As a new victim, er user, of Win 8 all I can say is the Store is some major league suckage compared to Google Play and from what I can see without actual hands on 8.1 does not appear to address all this suckage.
No arguments from me about this one. The Store does indeed suck. There's no better description. We can only hope that they'll work on this.
But, I think I've mentioned before...there's no real need to use the Store at all. I played with it a bit in the beginning. I realized that the Metro Apps that they're selling in there are useless for the Desktop, and I simply stopped using it. If you're using Windows 8 on a desktop, simply ignore it.