As I have said it runs good but the metro UI is horrible especially on a laptop and judging by how well Windows mobile has been doing on the market the world agree metro sucks.
I believe the same old rule applies, there are some that use Windows because they like it which all the power to them but many use Windows because that is all they know and people are comfortable with it. So what happens when you get average joe walking in and he sees windows 8 for the first time? Simple, chances are that person will stick with what is comfortable to them which will be either a Android or iOS device because for about 90% of users there is a app for what they want to do.