With my laptop, gnome 3 installs nicely but I have the same problem as described here... (Intel GM 945 chipset)
Installed gnome-shell, gnome-tweak-tool and did everything explained here: http://joostruis.wordpress.com/2011/08/04/149/
But no success at all...
Alas, now seems there are problems with some applications, mostly games, they doesn't start.
By running glxgears, it seems there are problem with OpenGL
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Error: couldn't get an RGB, Double-buffered visual
It seems then that it is installed not so nicely after all...
In my other computer, with a NVIDIA GTX 500 Ti, X directly crashed after the update... nor installing KDE resolve the issue.