I have been using Linux since 1996, and I am finding Gnome 3 to be very usable. I upgraded to Fedora 15 on a four year old Dell D520, and it has been a really good experience. I admit that it was a huge change at first, but I haven't found much to complain about. I missed the ability to shade my windows, but now I'm used to rotating them out on the fly. On thing I have learned in 15+ years of being a sysadmin is to approach changes with an open mind. Sometimes changes do flat out suck, but for me, Gnome 3 is a success.