I wished them luck, but I can't help but think that they've tried too hard to simplify/clean the looks and in the process they have left behind many of their existing users.
Maybe this new minimalist approach will attract new users, maybe it won't, it's just sad that you have to abandon so many loyal users in the process.
They've tried a revolutionary approach, and I believe a more gradual evolution would have served them better.
Some random examples:
* I just cannot wait an extra few seconds whenever I click on something, that's why I have (a lot more than) 3 buttons on my mouse: context menus and alternative actions are irreplaceable. And I am not going to buy a new non-fanless graphics card just so that my desktop does not slow down to a crawl. It may seem harsh to complain about a few seconds here and there, but my time is precious and when I want to do something I need the OS/DE to stay out of the way. gnome-shell fails on that count.
* And all this wasted space in the bar, but no - my status-icon (aka tray) application cannot be shown there!? Seriously? It has to be hidden in the bottom right corner, and virtually unusable there (and will never be found by new users there). Right, it's better this way. Of course.
* Also, it conflicts with VirtualBox regularly, when it doesn't just crash randomly (that alone would have been enough to make me consider switching - but I was willing to give it some time).
* All the Alt-Tab combinations just fail to provide the simple application switching I've been accustomed to. It's slower and less predictable.
I've gone through the pain of restoring the "shutdown" option and all customisations possible^W required to get a half decent environment, but this just isn't working.
I was quite happy using gnome2 without compiz, and now I can't even have that option: in Fedora 15, the fallback more seems to be gnome+compiz.
I haven't used KDE since the good old 3.5 days, but I have now switched back. It is not painless - far from it, but at least KDE allows me to make the decisions rather than impose them on me without recourse.