I've done the exact same thing. After using Unity for a couple of days and hating it I've installed Gnome 3. I've expected it to be great, it was a great disappointment. Thought about installing Mint but decided to give Debian a try instead. After several hours of tweaking to make it just right (mostly upgrading to wheezy (testing), font tweaks and theme) I'm in love. I don't think I'll ever use anything else.