1) On first boot, the OS should ask if you want to run in Tablet mode, or Desktop mode? You have a choice. In tablet, the os loads to metro, and metro is the focus of the OS. In Desktop mode, the OS loads to desktop. The start button is still present, and the option is there where you want to see the classic start menu of old, or the metro start screen when you click on it.
2) Let us customize the start screen. Let us choose a decent custom background. Let us change the default icons to something we can actually recognize. Change the size of them if need be. For instance, if I plan on rarely using one app, and frequently using another, let me make the app I use often large with some sort of custom icon so I can easily find it. I have the impression that the whole metro screen was designed by people who have no design skills what-so-ever.
I think choice is the key. If you want us to start using something, make it better than what we already have so that it is appealing to us. Don't make it a poor excuse for 2012 level software and then force us to use it. I can see some pretty big potential with Metro if it gets implemented even close to as it should. Implemented as it is, they have no right to act surprised when the back lash comes as it will..