Well, that's not actually right. Ubuntu is just another flavor of Linux, as Linux as any other distro out there. The fact that ubuntu comes with a pretty desktop does not make it Windows. But yes, it's fairly easy to setup for newbies. But then, does this mean you can configure it to be a server just that easy? Ubuntu is debian derivative... I dont know why people are bothered by the fact the works out of the box.
And for the gentoo comment... Yup, installing gentoo is a really good experience, but practical? I dont think so. Now they implemented a graphical installer. Nice move if you ask me.