I do have to give Brian a little credit, he has some good points in the video, such as the fact that Microsoft did drop the ball on conveying how to use the new features of Windows 8 and how to get to certain things.
Really though, after that, the arguments are flimsy at best. Like his not being able to close a Modern UI (which is what its called, not Metro anymore) really strikes me as odd because when I couldn't close it with a right click or something, I tried what most other computer users (and not techies like me) do, and tried Alt + F4, and boom, app closed. This was on my desktop computer, which has no touch screens, and when I went to my touch screen laptop (mind you an HP TX2 with 0 multi-touch), I thought "if I can drag an app from the side to get it back into view, then what happens if I drag it down?" and boom that closed it. Also tried that with a mouse, and hey, it worked just the same. Next is his in ability to get the control panel, which is rather simple now, if you are in the modern UI you go to settings from the charms bar that is seen in both sides, and select change PC settings, and that brings up the control panel. if you are on the desktop, that same method will bring up the windowed Control Panel just like before.
Also, to note on this, control panel icon is technically in the desktop folder of the user profile since about Windows XP (and that is the earliest I remember seeing it there), so that it is NOW in the desktop folder is a complete falsehood.
Another falsehood is the thought that you can only start applications that are metro from the start screen. You can have normal desktop applications with icons on there, and while they may not look as nice as the modern UI ones, they still can be pinned there. I also wanted to point out that the search functionality of going to start and using the search field still works in exactly the same way as Windows 7, except that instead of listing all results for that query in one big long list, they are broken down into different categories, and it is extensible because when you add an app say Bing, Newegg, All Recipes (apps that I have had installed) you can move between them with a simple click of that icon, so say you input Israel, to get from searching applications for that name to a map of Israel, you click the maps icon that is just down the list, and then to look what recipes have the word Israel in them you click All Recipes, then to get to the current weather there you click on weather, and finally if I just wanted it typed into the URL space or my browser I would just simply select Internet Explorer and go to the Internet and have the Internet right there to use. Really rather simple if you ask me.
Where he is partially correct and partially incorrect is the fact that creating a recovery disk and the problem of locating the product key. The product key not being printed on the outside of the computer is not completely Microsoft's fault, and really if he had bothered to do a search on the Internet (using possibly one of the methods mentioned before), he would have figured out that OEMs are now embedding the PID into motherboards of computers, especially laptops (which his comment at the end of this being done in a coffee shop makes me assume he was using a laptop), because the stickers would wear off, and then you would have the issue of no longer having a PID for the system. Now that it is embedded, you can take any Windows 8 disk that you can get, pop it in the drive, and the system automatically knows what its supposed to be. I have a new Lenovo ThinkPad Twist that the first thing I did was clear the drive and use an ISO I got from Microsoft directly, popped it on a flash drive (which ISO mounting is now built into Windows, so I didn't use anything besides Windows to create the USB drive), ran the installed on the ThinkPad, and it was activated and set and even had the Lenovo logo come up instead of the new Windows logo during the boot process, no need to have the product key or write it down or anything.
Continuity as an argument pretty much goes out the window as well because now, instead of there being menu interfaces and traditional overtures that there were in Windows 7, everything in the modern UI uses the same basic principles of design, and everything in the desktop environment does now as well across all the Microsoft products because the ribbon interface was made into the desktop UI. Also, that modern UI is seen in all Xbox gaming platforms, Windows Phone, and has apps for most of the major software coming out or already out for all their different business software segments that all use the same design principles to them. Even Remote Desktop, Dynamics, Office, Exchange and SharePoint are now following this same design model. So, really, continuity between everything that Microsoft is doing today in terms of their software is better than it ever has been because they are all using the same model for all the different pieces, not like when Windows Vista and Office 2007 came out and Office used one style of interface and Windows used another.
So really, I think that Brian did have some good points, like not being able to get the information told to the user as to what to do to close something, and that the flat styling of text not making it apparent what to click on where great arguments, and completely valid. The rest however, not so much as I have seen far less experienced users figure out how to do the things that he complained about in seconds. So again, he does have good points in there, but to go as far as to say unusable? I think that the fact that he included his contact info and a marketing of his services at the end is exactly what Brian was really after with this, and while I might be perpetrating that by commenting or viewing the video, that is still the whole point of the video and nothing more.