Reading through the results, it seems Gina's testers complained most about lack of obviousness, and lack of feedback. They did very well with familiarity to other platforms.
I find it interesting that testers were confused about the application menu, and the use of right-click instead. I think more work is needed in the application menu. In my previous usability tests, menus were an important part of usability. In GNOME, some actions are in a “gear” menu, while other “top level” or “global” actions are in the application menu.