Metro interface is definitely not designed for power user.
As you can see in the default mail application, there is so much wasted space. No wonder there isn't an Outlook version for Metro yet.
The built in news app shows white space. It looks like it is 20% content and 80% empty space. I rather read news on my smartphone. 3rd party calculator app makes it look like a blown up smartphone. Microsoft's own OneNote looks horrible.