The new Metro-UI is supposed for finger-usage, as needed on phones and pads, but surely not for mouse/keyboard users. So for all desktop- and laptop-users, W8 is a big backward step (compared to W7) in usability and so will not be a success for Microsoft.

Best solution would be the development of 2 independet OS, one for mouse/keyboard, one for finger. Merging and mixing both into one OS is the wrong decision, but MS insits on learning this the hard way.

Good Luck Folks !!