The Unix Hater's Hanbook says it well: "The original Unix solved a problem and solved it well, as did the Roman numeral system, the mercury treatment for syphilis, and carbon paper. And like those technologies, Unix, too, rightfully belongs to history. It was developed for a machine with little memory, tiny disks, no graphics, no networking, and no power."
Bu since wee seem to be stuck with Unix, I guess we need any guidance we can get.