The truth is that settled Windows 7 (or Windows XP) users with traditional PCs or laptops will get little benefit from Windows 8, and will have to endure some pain to learn its quirks.
That said, there are other classes of user for whom Windows 8 will make sense. The most obvious one is new users who buy hardware designed for Windows 8, such as the early examples from Acer, Asus and Samsung shown at the Computex show in Taipei later in June.
Windows 8 will also have value for power users, whether gamers or productivity users with multiple screens and numerous demanding applications. The engineering in Windows 8 is excellent, both on the Desktop and Metro side, and the benefit from this exceeds the pain of the various annoyances.