Metro is terrible as a desktop and tablet UI, but was fantastic for mobile interfaces. Microsoft's mistake was thinking UIs would converge across form factors.
I still believe the overall vision is/was good. They just would have had to make a few more compromises, like some additional optimizations for desktop where users could profit more from mouse and keybaord.
But another factor was that the change was just to deep of a cut, and the world was just not ready for it. People were overwhelmed when they were expected to suddenly use magic corners and gestures instead of clicking a button. If it would have been a slower change, it might have worked out better.
Seems like Microsoft thought if people could stomach the transition from XP to Vista/7, then the transition to 8 would be taken with the same amount of initial resistance followed by acceptance.
There's only so many times you can tell your customers that their hardware isn't up to snuff for your software, whether in terms of computational capability or interaction modality, in the same decade!
Does the maker of the video also write blog posts or anything? I'm very into this topic and I skimmed through the video, but I'm not sure I want to be essentially yelled at for an hour and a half.
Upon seeing the title I was hyped up but unfortunatelly it's just another yelling dude complaining about surface level stuff being not the way he likes.
I find reading faster and more useful (I can skim for key words, I can look for headings, I can inspect images for as long as I want) and less mentally taxing than listening to a normally-pitched reading by Alvin and the Chipmunks. :D