Has this guy even used win8? Yes, winRT is extremely restrictive in the ways that he mentioned, but win8 proper works just like win7 on the desktop allowing for multiple windows to be open, as well as snapping metro apps to the side of the desktop if you want. Yes, there is a learning curve for where all of the background settings are now hiding (are they in metro? are they in Control Panel? oi!), but other than that there is really very little practical transition between win7 and win8 for desktop users who are using mostly desktop applications. And if you have multiple screens? win8 is like a dream come true for people running multiple displays and are not allowed to mod their winXP/7 install to better support them.
Win8UI perfect? Absolutely not. But terrible? No, I think they are blowing things way out of proportion just to get their name out there. And in 2-3 years when gesture and voice control become more mainstream for desktops via devices like kinect for PC, LeapMotion, and even new innovations on the traditional mouse, we will think all of this as a truly silly problem.