One other thing to add: Windows 8 now wants to install drivers for your hardware in the background, so when it was installing my videocard drivers (without any indication beforehand), I suddenly dropped to a black screen for about 3 minutes. If not for the "new hardware found" audio notification, I'd probably have thought the OS had crashed on me.
I've noticed many of the same things that you mentioned in the article. One thing I don't like is that the Windows Key now cycles between the Metro UI (which can not be shut down as far as I can tell) and the last application. Also, some of the Metro apps have no clear way to quit them - you have to hit the Windows key again to toggle back to the Metro page. Alt-F4 does bring up the restart dialog from the Windows desktop (so there is at least one alternative to ctrl-alt-del), but it only works there.