I suppose it's a matter of personal preference, but a few thoughts.

I downloaded all the files necessary to use the KDE desktop instead of
Gnome for my 10.04 install of Ubuntu. It looked really pretty, very
colorful. But, forgive me, a bit obscure? I switched back to Gnome.
It was functional, it works, and I can navigate through it fairly
easily.

Rumor has it that 10.10 will resemble KDE. If this is the case, I do
hope they consider keeping an option to use the Gnome desktop, or one
similarly simple.

I'm sure others have had a different experience.