Cry me a river. What -is- it with Ubuntu that so annoys otherwise sane people that they turn into vitrol-spewing half-trolls ?
Any derivative always risks introducing own bugs. Nobody is immune to this. It's not as if Debian, Redhat, or anyone else is free from introducing bugs not present in upstream. (you yourself mention the most prominent recent example, then say you'll 'ignore' it. That's fine but it doesn't make it go away)
Any derivative that DOESN'T change things duplicate the bugs in upstream. Duh !
As for the "bad user impression", did it ever occur to you that people use Ubuntu for reasons OTHER than that it gives them a bad impression ? And reasons -other- than being clueless ?
Frankly, your condensing tone doesn't in the least make me sympathethic to that part of your complaint that is legitimate. (namely that communication and integration with upstream could definitely be better)
It also misses the mark. I've run Linux since I installed the 1.2.13 kernel coming with slackware whatever-it-was from a CD-ROM that was stilled divided into "floppy sets", I've run and administered hundreds of linux-machines of 3 architectures on half a dozen or so different distributions. Today I run ubuntu on all my personal boxes, except one that runs a different flavour every month that I use for testing and playing around.
Ubuntu has, in actual fact, managed to get something right. Refusing to allow that doesn't make it go away either.
And the tone you, and many like you, are using isn't likely to actually make anyone sympathethic to your views.