Just my opinion.
I like fixed desktops/workspaces myself. I have specific windows on each, a themed approach almost. I change between the various desktops with assigned hot keys. I know what is where. Gnome 3's method of creating and removing workspaces wasn't conducive to the my needs. Workspaces would get out of order from where I expected them, and I was unable to assign hot keys to specific ones. That may have changed since I last played with it.

But on a good note. I think Gnome 3 would work great with a touch interface. Being able to swipe in and out workspaces as needed definitely has appeal, and seems to be more of the way Gnome 3 was designed.

Thanks