Source: UseIT / Jakob Nielsen
quote: Double desktop (Windows 8 UI vs. the traditional desktop)Why? creates interface slowness and cognitive dissonance
quote: Switch to single windowingWhy? Hard to remember what you have open for complex tasks
quote: Photo/graphic heavy UI themesWhy? While nice to look at they convey information at a lower density than "uglier" themes
quote: Live TilesWhy? Third party developers show less sophistication than Microsoft, toss together confusing tiles that don't enhance usability or understanding.
quote: "Flat" look of Windows 8 UI tilesWhy? Hard to tell where tile boundaries are, icons are more likely to be less distinctiveCharmsWhy? Harder to use on traditional devices, are hidden (and thus forgotten), and don't work universally across Windows interface, so they confuse.GesturesWhy? Nielsen says the gestures are error prone and overly complex, such as the multi-step gesture to reveal running apps.