Terrible OS design for desktops, no new functionality. The only reason to purchase the OS is when the old desktop dies - at that point most go for an Android or Apple tablet, I mean who would go for Windows - there have been terrible feedback from such and such in the office!
The only thing terrible is how poor a job Microsoft has done in educating users how to use Windows 8. When trained and shown how to customize the Start Screen, users see and enjoy the benefits and the time-savings. It's mainly when people attempt to apply their old methods of using a computer without objective (and dare I say, positive) guidance that you have negative feedback.
Instead of the "Hi" and "You can get new apps from the store" messages, a program should start that guides users in customizing their Start Screen with the programs, apps, people, websites, and content that matters to them. When people without a pre-conceived bias are shown how to do this, they generally like Windows 8.