Infoworld has a review
of 9 programs to replace TIFKAM (The Interface Formerly Known As Metro) with something more usable on the desktop.
I haven't looked at W8 too deeply, nor do I expect to have the time to do so for another couple of months, but I have seen enough to know that TIKFAM is an absolute non-starter for me as a desktop environment, which is where I spend much of my time.
Microsoft seems to be interested in fostering software innovation among outside developers-- the degrading of Explorer in W7 led to a profusion of excellent file managers. I look forward to the software that smart people come up with to get around the flaws in W8.