Perhaps those complaints have some merit: http://linuxfonts.narod.ru/why.linux.is.not.ready.for.the.desktop.current.html. Don't know if it's all true, but it doesn't seem like a bad idea for people to do some research into Linux problems if they want to switch.
If half that was true, my parents (+60 years old), my girlfriend (who is a chemistry student without deep computing knowledge) and most of my friends wouldn't be using GNU/Linux on a daily basis. And they do, with no problems whatsoever.
They produce technical documents, watch videos on youtube, watch downloaded films and series in a perfect smooth way, surf the internet, etc... and they don't need my technical assistance at all once the system is installed.
What's more: they daily have a nice, responsive desktop computing experience, whereas their computers struggled to do anything back in 2009 when they where using Windows Vista instead, before I moved back to my small town and started installing Lubuntu/Debian everywhere.
You can't start to imagine how much quality their computing has earned through using a proper OS like a good GNU/Linux distro.