Windows Phone App UI Issue

I know that developers aren't required to follow the stock WP app UI, though most do just because it's easier. I love the WP aesthetic, and I've been a Zune owner since it's first release, so I have no qualms about Metro (or whatever). The only issue that I have with apps on WP is the layout of the UI.

Rooms-1_medium

via liveside.net

As you can see, half of the screen is given to just the title of the app and the sub-menu you've chosen to be in. This leaves just half of the screen for actual data. Maybe this isn't such an issue, and it's not turning me away from buying a WP device, but it is definitely something I am keeping in mind when downloading apps. I want to actually see the content of the app, not just it's title and sub-menus.