My impressions still hold on Gnome 3: it is a change, but I kind of like it. I only had to tweak it a little bit to get back my blue title bars, and I'm fine. I guess Gnome 3, and specifically the Gnome Shell, is something you either love, or something you hate. There doesn't seem to be much middle ground.
If you miss the extensions and themes of Gnome 2, I thought I'd point you to where to get Gnome Shell extensions that might make you happy. We've talked about Gnome Shell extensions before, but now all those nifty extra features have been collected into a Gnome Shell extensions web site: extensions.gnome.org.
They have some neat extensions listed there. Here are a few to interest you: