"The complaints led us to question interface experts, who universally panned the dual-natured design of Windows 8. The complaints came to a head when usability guru Jakob Nielsen published a scathing blog post deriding almost every aspect of Windows 8's design. His brutal examination was then re-blogged far and wide.
Nielsen blasted the flat, non-intuitive look and "low information density" of the modern UI. He derided the way Windows hides commands in off-screen menus, and its too-shifty live tiles. He ripped into overly similar gesture controls, and Microsoft's decision to display just a single Windows 8 app at a time. "The product ought to be renamed 'Microsoft Window,'" he quipped.
The dual desktop and modern UI in particular create cognitive problems for everyday users, Nielsen says. In his opinion, Microsoft made a big mistake in attempting to create a single operating for desktops and tablets alike, as the two have very different uses and form factors."
When W7 was introduced many people recommended the upgrade to their friends. Not W8. The consensus is to avoid W8 for desktops and laptops, maybe postpone one's laptop purchase until next year and hope MS returns the W7 desktop option to W8.