So far the preview is a step in the right direction. Still don't see what all the kafuffle is all about and the rash of downvotes are for, but people have a right to their opinions.
Though - all they did was map the start button to Windows Key + X.
For those of you who want an easy way to search from whatever you doing, you can do Windows Key + S and it pulls up the search pane on the right hand side of the screen. (noticed a lot of complaints on the forums here about this)
For me, Windows 8 hasn't changed much of anything as I still live in the command prompt, power shell, and shortcut keys (and I like the improvements in Server 2012, previewing 2012 R2 on a test VM at the office).
From a business perspective, I think Windows 8 is a right move - because a unified platform is the right direction. Did they get it right out of the gates? Absolutely not.
Do I think that it is a gambit that will pay off in the long term? Yes, I think in a few years it will prove to be the correct move.
Anyone who preaches the imminent doom Microsoft are the same sort of hacks that believe that Apple, Google, Oracle, etc. will be dead in three years. In the case of Microsoft, I've found it's usually "Power Users" and "Arm Chair IT".