As a Gnome user, I've been reading about the Gnome3/Gnome Shell release and decided to see for myself. I downloaded the Fedora 15 Alpha release with Gnome 2.91.6 and after a bit, i came to this conclusion:
Gnome3 is the antithesis of productivity.
My main issue with Gnome3 comes from the Gnome Wiki page GNOME Shell Design FAQ