" Usability Studies " ? i dont see any so called studies? got any links to prove these theories of yours? can you theme Unity shell? NO go over to the gnome mailing list an you'll get some facts why the Gnome-shell is so much better than Unity, maybe you should of did that before you made yourself look stupid.
Sorry, but I tried both - Shell and Unity and Unity was much more comfortable for me, so I don't have to make any studies to say this.
It was enough to type "unity usability" in Google: