The worst thing I found with Windows 8. Using any of the metro apps, there was embedded advertising inside of the apps. Upsetting to be advertised to inside of applications running on an O/S that I paid money for.

It's ok though, they fixed it, when I upgraded to Windows 8.1, the upgrade destroyed my ability to run metro style apps at all - I just got some arcane error message when I try to run/launch anything metro related.

I went back to Windows 7.