My points are valid. I remember when Ubuntu took up each of these issues and adopted or created software to solve these issues.
Network manager is far from perfect. Try setting a static IP address for you wired adapter with network-manager. Or getting a working bridge going. Or having a wi-fi connection active upon booting a computer but before logging in. When Ubuntu adopted network manager and people filed bug reports and brought up those shortcomings. Ubuntu said it wold get taken care of in the next couple releases. They did not.
They said we would have grub to desktop graphic boots. Did they work on it for a bit. But even now, most desktops do not have a graphic boot from grub. Forget about that as an out of box experience with a Nvidia card. From not working in GRUB you move to not working in Plymouth Again Ubuntu did not create these technologies, but they did adopt them, set as a goal what they wanted to do with them. Then they fell short, got bug reports, promised they would fix it in a release or two. After a release or two, they announce another half baked initiative and move on.
Does pulse audio work? Yes, Does it still have issues? Yes. Can it be a pain to get software designed to work with OSS or ALSA working with it yes it can. I have every right to complain. Ubuntu promised 6 years ago when they adopted it that they would get it all fixed and sorted out. They have not.
You mention Unity and Upstart. Upstart still is not delivering on Ubuntu's promised sub 10 second boot times. Which by the way, were promised with graphic boot screens as well. Still not happening. What about 200,000 million users by 13.10? Again another half baked promise.
Ubuntu has done a lot. The Linux desktop is better off than it was in 2006. Ubuntu has helped improve some of these projects. But so far, every time Ubuntu announces an initiative and makes some big claim about what they will accomplish, they end up doing a half baked job when you look at how well they have met their objectives.
200 million users by October 2013
10 second boot times
Desktop looking better than OS X
100% graphical boots on all Linux systems.
Network manager as robust as OS X or Windows XP network manager
Pulse Audio as robust as OS X or Windows XP sound system.
I am not the one making these promises. Ubuntu is. They are the one telling us we should all hop on board and promote Ubuntu to all of our friends. All of this great stuff they are doing.
What I see are half-baked half-fulfilled promises. Being told we are a community, and the minute the majority of us don't like something like the close button being moved to the left side of the window, or Unity. we are told Mark is in charge and it is not a community decision. I see the word Linux purged from anything Ubuntu is involved with. I am tired of being lied to and treated like the ugly girlfriend that Ubuntu want to have sex with but will not hold her hand in public.