The problem with this Windows 8 is that everything has been jumbled around. Even advanced users have to relearn where to find everything again. The Start button that we've grown accustomed to for the last 17 years is no longer there, so it requires everyone to learn how to access things all over again.
As for the classic UI, it's not even that helpful either. You have to use Windows Explorer to find everything you need. Put the Start button back in the classic UI, then I'll actually consider the switch to Windows 8. Until then, no way. The Metro UI is awful to use with a mouse. They are taking a touchscreen OS and having us use it without the touchscreen capability. That's like giving you a Windows tablet and saying "The screen is broke, but here's a keyboard and mouse to help you get by."
As for adding tiles to the Metro UI, I found it to be a total pain. Any shortcuts that you wanted to create, you have to go through a giant process of making it, and then hopefully it worked. Gone are the days of simply right-clicking and then selecting "Create Shortcut".
Anyway, I tried it out for a full weekend. While the performance of Windows 8 was fantastic, the user interface needed serious improvements. Those who install the OS probably sat at the Metro UI asking themself the common question, "Ok, how do I make it work?".