Looking like they've done a fairly reasonable job here. As per my rant on Win 8 on release:
I can see what MS are aiming for, and I think they're being very longsighted in trying to unify their mobile and desktop OS'. However, we are not even close to the point where this is of any benefit to anyone, and not providing the option of switching back to the old-style UI is highly aggravating.
It seems like they're finally getting the balance right - leaving the desktop users to their desktop apps (or allowing Metro apps to be used in a more traditional desktop format), and the mobile users to their mobile apps, with the option to switch between the two when appropriate (e.g. Surface Pro - I desperately want the 4 to be released so I can get one!).
I think Win 10 to Win 8 will be the Win 7 to Vista. A much better version of an important (and fundamentally beneficial) change to the OS which was initially poorly implemented and understood. Quite looking forward to it now.