Gnome2 was a good functional desktop, sure it was copying the 2000s with windows 98/2000 style, but it worked. Hell, even OpenStep is more functional than Gnome3 as a daily computer interface.
Gnome3 targeted a weird mix of incompatible devices, like a windows 8 interface, and kinda failed as a design given the devices it optimized for never took over the market. There's not that many tablets running Gnome or touchscreen laptops anymore.
It's almost like Android took the design team by complete surprise, while they tried to make desktops a tablet experience, but failed at doing both.