Ubuntu is the name chosen for a global project and a distro based on Gnome. Kubuntu is another distro based on kde from the very same project.
I believe they deserve the same support from the project since Gnome and Kde are the most popular desktop manager out there.
It seems quite obvious to me, the project is very much focused on one and only distro, its first baby : ubuntu.
And it shows. Kubuntu web site looks quite poor and unprofessional compared to ubuntu. Most graphic choices like the kdm default theme (even if it's supposed to be a matter of taste) look, again, unprofessional. And finally the whole distro doesn't seem to have the same amount of attention when it comes to details (one example among others: the little thing on ubuntu warning the user about the existence of proprietary drivers for display which does not exist on kubuntu).
I've been told once, like a year ago, by an ubuntu dev that the situation is such because the project doesn't feel like fragmenting its market share.
Whatever is the official position of the project, I don't think you should do things half way.
The Kde project is itself in full evolution with Kde 4. It does deserve full support from ubuntu.

Thank you for reading.

When I start the Ubuntu LiveCD and my keyboard or mouse isn't detected that is very annoying. We cannot expect people to know shortcut keys to start a mouse, or how to turn the on-screen keyboard on.

When removing a package, it would be nice to have an option to remove all config/hiscore/... files (including those in the home directories) and not only the system wide ones.

I'm not sure whether this should be the default or not (probably not), but it would nice to have at least the option.

I like to try lots of programs to see if anything exist that is better than what I currently use. In most cases, I remove them right after I tried them. Even with a purge, they still leave their "user" configuration files in my home directory, and it's kinda hard to know which file comes from what package, so over time my home directory gets cluttered with many of those config files (and this awfully reminds me of the Windows registry clutter) and I have to guess which one are still useful or not to clean it up a bit.

Ok, now I guess this wouldn't be an easy task since I don't think packages include any information about the files created in the home directories. It might be a good idea to push for such an idea though.