To be honest, I don't think W8 deserves all the criticism. A combination of "love to hate M$", "every second OS is bad" and "join the crowd" is generating a lot of hate for W8 before it's even out.
Yeah, metro isn't designed for desktops, but 2 clicks and you're in the same familiar windows atmosphere. Combine that with small tweaks and a totally overhauled Task Manager and I, for one, say windows 8, while not necessarily meriting an upgrade from 7, which is very good, is NOT a flop OS.
Time will tell, I suppose.