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Under development for several years as the replacement for GNOME 2.x on Linux-based desktop OSes, GNOME 3.X has slowly exited "experimental" mode and has finally become the default UI on Redhat's Fedora distribution, which replaced the very much long in the tooth GNOME 2.4 with GNOME 3.2 in Fedora 16.
Fedora 17, which was released in May of 2012, includes a further refined version, version 3.4.
While GNOME 3.x includes a number of software enhancements over its predecessor, Linus Torvalds, the inventor and maintainer of the Linux kernel has hailed the 3.4 software release as a "total UX failure" and "one step forward, one step back"
Look, if the chief penguin himself slaps you down, you know it's time to go back to the drawing board, GNOME-ies.