I haven't yet developed for Windows 8 and RT yet but having developed apps for the Windows scene since the 90s I have seen a lot of technologies come and go, and invariably -- and not having done the work you've done I may well be completely wrong here -- people will say it's not like the preceding technology stack and ipso facto is crap.
For instance: MFC/Straight-up GDI devs moving to VB/Delphi/Powerbuilder; Delphi users moving to .NET; .NET Winforms developers having to relearn everything when WPF came out; etc.
Is it anything like that or is it truly busted?