Win95 levels of sophistication?
they've dragged the desktop GUI back to Win 95 levels of sophistication.
I'd say you went too far into yesterday's future. The Start Screen is basically a revival of the awful Program Manager UI. It's even been commented by TIFKAM detractors, and they're probably right on the spot. App-centric UI makes sense in mobile devices but it never made sense in PCs. The whole Win95 UI revamp copied System 7's (and earlier) approach where files were the main thing on UI navigation, and it was one of the most liked changes in Windows.
And now they backtracked on that.
As many others have mentioned already, the optional Launchpad app which did attempt something similar to what Metro does (stick a mobile UI on a PC OS) is probably the one app that is either unused or hated by most OSX users. Noticeable by the fact that most OSX users are probably iOS users as well, so it isn't that they don't like that UI at all, they like it as long as it keeps to their mobile devices. This is where MS failed: their TIFKAM interface was loved by WinPhone 7 users when they put that on their new revamped WinPho OS. Then they force-fed it to Windows 8 … which has now turned it from "nice mobile UI" to "that fugly thing on new PCs".