I switched my desktops off Ubuntu to other Linux distributions. It isn’t a great sacrifice as I use multiple Linux distributions in any case; although, for a moment all of the Desktops in my house were Ubuntu and it did make it nice for the casual user.
The problem was Unity and issues ranging from graphics problems to simply philosophical concerns over a desktop that restricted me to a single distribution. Not that Unity might not get love from other distributions, but it won’t, and the BF is not going to change either.
And this leads me to what I am using on the old machine in the Kitchen: MINT. I know that Mint 11 has an RC available but I am find using the LXDE version of MINT 10 as the RC did not load the graphics properly.
But for the other machines it is Fedora 15 for me. I include this link on How to Painlessly Switch from Ubuntu to Fedora. I will point out that sudo works perfectly fine on Fedora and that as I have replaced Skype with Chrome / Google Chat Video I find that everything is working great for me. I really like Gnome 3, although as I found KDE 4.6 nice as well, I have my choice and I find that from the user perspective both are improvements over Unity at this point. YMMV