Why do various application bars like the menu bar look obsolote in Natty+GNOME 3 compared with Fedora ? See the difference between window panels in F15 Gnome here and a screenshot from my desktop:
While the main interface is quite similar in both the OS.
The Ubuntu theme was not ported to GTK+ 3 yet and therefore only a fallback is available. This also affects the current 11.10 Alpha 1 and will most certainely change in the future prior to the Oneiric Release and might be ported back to Natty (I am referring to here).
You can also try to manually set the theme to "Adwaita" in your appearance preferences rather then waiting for the Ubuntu themes beeing ported which should have been installed with Gnome 3 if you want the standard look (e.g. like in Fedora).
