“The underlying problem is the idea of recycling a single software UI for two very different classes of hardware devices. It would have been much better to have two different designs: one for mobile and tablets, and one for the PC.
I have great hopes for Windows 9 on mobile and tablets. Just as Windows 7 was “Vista Done Right,” it’s quite likely that the touchscreen version of Windows 9 will be “Metro Done Right.”
I think Nielsen has some good points on Windows 8. After I’ve been using it on a touch tablet I really feel that all these “non-visible” gestures cause a cognitive overhead.
The performance of the UI though is great - it feels fast and nice. But like Nielsen points out: this Windows feels like a Vista waiting for the next Win7.