Meh.
Ubuntu was always little more than Debian with a few tweaks. They are a little bit more "desktop centric" but that about it. This persistent myth that Ubuntu was the first distribution to be "easy" is just bullshit. Most of what Ubuntu interesting was cribbed wholesale from Debian.
"easy" != "interesting". What made Ubuntu popular was that it was all the Debian goodness of apt, combined with all the useful goodness of software that wasn't three years out of date, and a mature, elegant theme wrapping the whole thing up. To me, Ubuntu has been the only distro I could recommend to newbies without any doubt that everything would work, and work well. And these days, when I no longer have time to build everything by hand, Ubuntu is the OS that gets out of the way and just lets me do my work.
I don't think Ubuntu would ever demure on the debt they owe Debian. But if you think the Debian installer had anything on Ubuntu's installer back in Warty Warthog days, you're kidding yourself. It was way easier to install, and that in and of itself was probably the reason for its popularity. (And, you know, up-to-date software. Stable Debian releases ... well, they were rock solid, but almost completely useless in a desktop context.)
(I suspect that ease of install has always been a prime mover in distro popularity -- before Ubuntu, I seem to recall it was Mandrake that was the easiest to install and top-of-the-pops.)