Common UI
All the bleating about the start screen seems to be nonsense to me. It makes sense to have the same style of interface for users desktops, laptops, tablets and phones. It doesn't matter that two of them are not touch devices, the style makes it easier for users. It seems to me that it is only a few of the IT journalists that didn't get it and they have unreasonably influence those who were not prepared to fully try it themselves.
I've used every version of Windows (and DOS, CP/M, OS/2 and many versions of Linux) and windows 8 seems to be the best so far. It has all the benefits of Windows 7 plus a UI that is like my Android phone. As Deb pointed out it also has UEFI and secure boot. It is faster than 7 to boot, it doesn't appear to carry as much baggage as previous updates. I think after the inevitable resistance to change it will probably be the most successful Windows yet.
I will be demonstrating it to other retired computer users at this month's computer club.