KDE.
Back when everyone was failing horribly trying to come up with a new desktop that nobody wanted KDE was the only one to get it right.
Instead of trying to shovel some bullshit "next generation" interface down your throat they decided to make all of the interface parts modular.
If you want traditional start menu you can have it, want Mac style dock got that covered, want a touch/table type interface it's in there. If you can't make up your mind you can setup activities to flip back and forth.
Cinnamon is so nice. It's what got me into Linux Mint 14.1 back when that came out.
After 20 years of casual distro-hopping with windows as my main, I finally landed on Mint Cinnamon about one year ago, gave up windows completely and haven't looked back :)