This is not really GNOME Classic. It is a substitute. It used to be called
GNOME Fallback Session, but they hoped that by calling it GNOME Classic
after the 2.32 desktop that the controversy would go away. There are
more complaints about it that about Unity. It is really just the GNOME 3
panel with a menu instead of the Dash. You lose more than you gain.

Here is what it looks like:
www.webupd8.org/.../...gnome-session-lands-in.html

Real GNOME Classic was built on the GNOME 2.x framework and had a top and
bottom panel and you could run any application from the system tray. You
still have no ability to modify the panel and it is still GNOME 3
underneath, but it may be preferable to some users. I think that it was
brought back to blunt criticism more than anything else. Try it, though.
You may like it. Personally, I prefer Unity, if I had to choose. That way
you get all of the power or lenses and Dash.