The interface formally know as Metro is a nightmare to use on anything without a touchscreen.
Well, the real problem at the heart of Windows 8 is that it switches between two totally different interfaces to do different tasks for no good reason.
Once you install ClassicShell or similar it is fine, and basically just Windows 7 with some nice iterative changes. Bootup times are much faster too.
Nothing they showed of Windows 10 is really convincing me it'll be an improvement. If they have a simple option to turn off all the Metro stuff, Clippy 2k15 (aka Cortana) and all the other useless guff, I'm sure it will also be fine.
I have no idea why Microsoft think that people want to use apps designed for a touchscreen on a device without a touchscreen.
The Windows App Store is a right mess, full of fake apps, clones, and junk.
The "new strategy" Microsoft are taking is actually a decade old
. It didn't work then and it won't work now.