“Disappointing Usability for Both Novice and Power Users”

Jakob Nielsen writes a thoughtful criticism of Windows 8 from a usability perspective, highlighting some of the issues the new design paradigms introduce. The points he raises mirror my main concerns. It's a long article, so Jakob's summary is handy:

Hidden features, reduced discoverability, cognitive overhead from dual environments, and reduced power from a single-window UI and low information density. Too bad.