Windows 8 is not prime time
I have used every Windows version since conception. Each had benefits and problems. Windows 3.x truly had the best human interface for a user that has many different programs and demands icons over program names to manage access. The Windows 3.x's ability to create sub-windows on the desktop to manage applications related by type was an invaluable option. Had this concept been incorporated in Windows 8, The metro interface would then be meaningful. It would provide an uncluttered start screen and the ability to group tiles (Icons) so as to be useful. This would provide easy access by both the tablet user and the desktop user. A win-win situation.
Windows 8 as it stands will not be useful to professional desktop users unless the missing start menu is replaced. Once the start menu and the metro interface are made optional, Windows 8 will be a perfectly usable OS for the desktop user.