That's putting it mildly. A split menu may be correct from some design point of view (e.g DRY principle) but from a usability point of view, it's recipe for frustration.
On a more general note, does no one else consider Mac-style "alt-tab switches apps" and "global menu" usability mistakes? (on grounds of being modal)
With both Unity and Gnome adopting these, I no longer have a compelling reason to switch from Mac back to Linux.
Which is a pity really, because Gnome 3 is one of the prettiest and most usable desktops I've seen: I love how the windows key gives you access to the dock, all windows, workspaces and search at the same time.