It seems that Microsoft has learned a lesson from Google and Apple. The new Metro UI is very simplistic – just like iOS or Android. Don’t get me wrong though: Windows 8 interface is very different from competitor’s mobile OS. It is however based around similar concepts. The new GUI is very easy to use, either with mouse or fingers (unfortunately I couldn’t test the touch control myself, so I believe the people who did). Animations are smooth and simple, without too much bling. UI elements like buttons and text fields are large enough for touch control, which also serves another purpose: it removes clutter from applications, making them easy to use.
Overall feelings are very positive. Metro feels fresh, easy and is something new, instead of being a copy of Android or iOS. Metro has already been available on Windows Phone for some time, but I think it will do fine not only on mobile devices: Metro looks just as good on a Full HD TV!
PS. Metro requires at least 1024 x 768 resolution.