My family is generally Apple oriented (much to my dismay), so we don't actually have a Windows 8 machine (my brother does dual boots win7 on his mac though).
Anyways, we went to the Microsoft store to try out the Surface. I ended up trying out windows 8. I have to say I don't really like it a whole lot. It works well on the Surface and Windows Phone, but I dislike it on the desktop.
When using the test computer at the microsoft store I barely used the start page at all. It was more of a burden and useless toy. The desktop was actually useful.
Altogether, until games actually use Dx 11.1 (which is unlikely, they will probably just skip to Dx 12 when it comes out). I'll just stick with Windows 7.