Currently, gnome shell is no longer officially packeged with Ubuntu, it now comes with 'Unity'.
I have to say, since early gnome shell and then the switch to Unity I went with Linux Mint for a while. Then I got tired of it, tried fedora, didn't like it, tried OpenSuse, didn't like it, tried Kubuntu, too quirky.
Then I went back to Ubuntu Gnome Remix, and updated. Since then (along with installing necessary add-ons to gnome shell), I absolutely love this desktop environment.
Please use this thread to cast your vote for Ubuntu to officially ship with Gnome Shell instead of just Unity...