Could you please make some kind of scale of "support quality" with referring to other telecommunication companies on this area. For sake of it let´s say that in last 3-5 years. Make list of different companies and compare how they have managed to give support to their devices and put N900 on that scale.

IMHO
After N900 release we have seen huge amount of bug fixes (IMO it should have matured little bit before release but still) and looking Maemo´s bugzilla looks like it´s still getting those fixes for next PR release. Some people are happy and some people are not. Also we have to remember that people talking here are just little minority of N900 users so no-one really knows how happy/unhappy N900 users are. I would care to say that most of N900 owners do not even understand what maemo is. Maybe Nokia has some kind of internal statistics from web questionnaires so they probably know how some of users are feeling about this product.

But after all. the best channels to give feedback and complain are:
http://discussions.europe.nokia.com/...ces/bd-p/maemo
http://conversations.nokia.com/
http://twitter.com/nokia