You mean aside their Qt / KDE developer when they dropped Kubuntu as an official 'remix'?
Personally I've never liked Ubuntu, not even in the early days. I think it's one of the worst distributions for consistency. They bring in largely untested components prematurely (Pulse Audio), change the GUI every 6 to 12 months and even propose breaking established standards within the Linux world (eg 'Windicators' : http://www.osnews.com/story/23243/Shuttleworth_Unveils_Windi... ).
Don't get me wrong, I'm all for a dumbed down distro for new users, but I really don't think Ubuntu is the best out there. In fact I think it's probably one of the most over hyped.
However what Ubuntu has brought us is a common base (be that via vanilla Ubuntu, one of it's many 'remixes' or even the spin offs / forks like Mint) and better exposure to the Linux platform. Had it not been for Canonical -or more specifically, Mark Shuttleworth- then I'm not convinced that we'd be seeing Steam on Linux.
The beauty of Linux is Ubuntu can co-exist with Gentoo, Slackware, Arch and all the other extremes of the Linux ecosystem. So I can run my 'hands on' distro of choice, and my wife can run her 'hands free' *buntu fork.