Jakob Nielsen reviews Win8, and based on my use of SurfaceRT, I agree completely.
And before you dismiss him as an Apple fanboy, read the last paragraph. He switched from Mac to Windows some years back and is a fan of Win7.
Windows 8 — Disappointing Usability for Both Novice & Power Users (Jakob Nielsen's Alertbox)
Another more mainstream scathing review:
What not to buy on Black Friday: Windows 8 PCs & laptops | ZDNet