Unity v/s Gnome Shell v/s OS X Launchpad

Unity Gnome Shell OS X Launchpad Manish‘s tweet about Gnome shell being usable resulted in this impromptu conversation and comparison. I know all three are in development – but this how it looks currently. Gnome-shell looks way too cluttered, Unity’s icons seem to be too big while Launchpad seems to have gotten the right balance.