Maybe I'm in the minority but I just do not like the Unity user interface.
Immediately after installing Ubuntu I installed gnome-flashback.
Later, I was reading about Gnome 3 (v3.12)and thought it might be interesting.
But, the writeup stated that you needed to have Gnome v3.10 installed first.
With gnome-flashback, the command gnome-shell --version was "command not found"
I noted Gnome Desktop in the Ubuntu Software Center and thought I would give it a go.
Now gnome-shell --version worked and it showed GNOME Shell 3.10.4
With v3.10, now I could install Gnome 3. I did.
But, with this new Gnome Desktop my icons I had in the top status line were no longer there.
And, when I clicked the single menu item in the top status line, it showed that ugly Unity look.
I backed out Gnome 3 and reinstalled gnome-flashback to get the true classic Gnome with no Unity look.
So, folks, if you are like me and do not like the Unity desktop look, stay with Gnome-Flashback.