Except from kernel developers that are employed by your distro, right?*
Look, I understand that if things don't work with the current open source driver, people will run proprietary drivers. I did exactly that for many of my users (example: before nouveau, there was nv, which didn't have good support for dual head, so I _had_ to give my users Nvidia driver so that they can use the second screen).
But, but, but... If Nvidia released their driver as open source when they should have, everyone would have a better solution and it would be fully supported by kernel devs too. The only reason all this stuff had to be painfully reverse engineered is because Nvidia refuse to do the right thing. So, yeah, of course it's not as good as Nvidia stuff (yet). The guys working on nouveau are doing heroic work, IMHO.
*) You can look at kernel bugzilla and verify that many people running Debian, Ubuntu, Fedora etc. kernels _do_ get their problems heard and resolved. You can also verify that in e.g. Red Hat bugzilla, indeed, kernel developers employed by Red Hat help users regularly. The patches usually end up being applied upstream.