I partly agree. Windows 8.1 isn't as tragic as it seems at first. But they've forgotten one of the primary goals of a UI: discoverability.
I'm a Linux geek, so I'm used to typing arcane commands into shell prompts. I can find whatever I need in a Google search if I don't know it already. Command line interfaces require you to specify what you are looking for. It's expected that you should know in advance what you want and how to ask for it. This is somewhat less true for the double-tab interface in bash, but still, the basic idea is to specify.
What made Windows and MacOS such a big deal back in the day is that they were "discoverable" - you could figure out what options you had available by reading the menus and picking one, with the basic expectation that, if there was an option or command to run, there'd be a menu entry in a hopefully sensible place to allow it. Thus, anybody could "use" a computer by finding the obvious start button.
Windows 8.x tosses discoverability to the wind. You just have to know in advance which combination of swipes and from which side in order to get what you want. Because of this, it's not discoverable. What makes Windows 8 so damning and frustrating for the new user is that stuff happens and there's no obvious reason why.
With this recent statement, Microsoft has made clear that they're going to try to double down on the Metro Interface, and hope that by promising it at some distant, future date, the haters will shut up long enough for people to get used to the not-discoverable Windows 8 interface.
I have mixed feelings about this.