So says Gregg Keizer @ Computerworld.com in this article Windows 8 was a strategic mistake that fails novice and experienced computer users alike on both tablets and traditional PCs, a usability expert said Monday.Nielsen cited issues such as the dual UIs, and the human "memory load" that results; a lack of multiple windows in the Windows 8 Store touch-oriented mode; hidden commands; low information density; and error-prone gestures.Nielsen based his take in part on testing he conducted with a dozen experienced PC users, who were asked to complete tasks on both traditional PCs and on the Surface RT.But testing revealed that users had serious and persistent problems figuring out what Windows RT wanted from them, and were challenged by relatively simple chores. In one test, the participants were asked to compile a list of three recommendations for a night out, send those suggestions to a friend and acknowledge the reply."That was enormously complicated on the Surface RT because of the single window model," said Nielsen, referring to the one-window-at-a-time UI for Windows RT apps. And even though the OS offers a split-screen mode, "None of our test users were able to make this work.".Read the story and draw your own conclusion.