I have been a Fedora GNU/Linux user since Core 1 when it first launched and have continued to use Fedora up to release 14 which I used until it reached EOL. I have been happy with the classic Gnome desktop which is fast, configurable, pretty but no fancy stuff just for the sake of it. I have dabbled with other disro's and KDE but always ended up back with Fedora and Gnome.
I then tested Fedora 15 and did not enjoy the experience much. I found gnome 3.0 to get in my way, trying to be clever and holding my hand too much. I know some like it as they like ubuntu's Unity interface but I prefer a 'classic' desktop experience with access to a standard file manager, terminal and all my apps without having to dig around and search for them. Gnome fall-back mode is just a sticking plaster approach IMHO.