This reminds me of when KDE4 came out. Was completely unusable. Back then I tried openSUSE with KDE4 and there were so many things missing and so many bugs in the preview that I just could use KDE4 to check how it looked, no network, no almost anything.Finally KDE4 has evolved and now is a matter of liking, you like or you don't KDE4 so you don't use it or you do. It is going to be the same with Gnome 3.F15 has a Control Center pref to Fallback to Gnome 2 panels, so one can stuck with the "old" look and feel of Gnome 2. So no big deal to move on. If don't like Gnome-shell, can still use Gnome 3 with Gnome 2 look and feel.