My Dad has been begging me to install Ubuntu on his MacBook Air. I think it's time I did.
It's also worth mentioning that Ubuntu has perfect support for the current Macbook Pro and Macbook Air, so I don't know what point you're even making by saying that OS X has hardware support for Macs.
Apple has a hard time matching the speed and flexibility of a lightweight GNU/Linux distro (presumably because OS X's focus on polish, integration and aesthetics means they want to tip the scale of compromises back in that direction, and that's fine). Some of us don't mind not having drop shadows and pervasive "cloud" integration if it means we can have full control over our own computers :)