The page

http://live.osgeo.org/en/overview/marble_overview.html

is supposed to give an overview over Marble. This is still a bit short. Compared to the QuickStart this description should be more comprehensive.

The information should not overlap with the QuickStart chapter: Don't just copy over text from there but try to make up your mind how the Overview can be different from the QuickStart: 

- It could more focus on a more comprehensive overview of Features. As such it could still borrow a bit from http://de.slideshare.net/marbleglobe/marble-1-6en (but not the same snippets as for QuickStart).

- It can point to (and partially reuse):

https://marble.kde.org/kml-guide.php

https://marble.kde.org/features.php