I can see some logic in trying to make the UI similar across devices, but I think MS have got it totaly wrong in this case. Different devices and screen sizes need differnt methods of interaction.
Mobile phones and tablets with a touch UI work great. But the main driving force behind this is the size and the fact its designed to be a portable device.
With a desktop you have a very different experience. The UI should represent this and take advantage of this.
Laptops are in the middle of the road and I think the user experience should be determined by how the user is likely to use the device.
If I'm out and about touch control is perfect on my phone or tablet, but when in the office doing work I need a more effective way of opperating the system. Keyboard and mouse works great coupled with a decent menu system. Windows 8 doesn't cut it for me.
The gap between a pc and a consumer device is closing and for hardcore power users the devices are becoming less useful.