An issue with one printer is pretty much what her argument is based on. I've had no stability problems with any release of Ubuntu that wasn't a development one, and even know I sit here typing on Lucid B1 which hasn't had problems since I upgraded from A3. Her follow up article though seems more stable itself, and she her comment on the Ubuntu community is correct, generally speaking, the Community is excellent, the most powerful force Ubuntu has. Ubuntu Forums are a minefield of information, and often turn up in Google with answers 
I don't think it would really be better to "tout LTS as the stable "Linux for human beings" and the six month releases as cutting edge." LTS's are stable, but often lack the features that people will want. I had serious problems back on Hardy with Samba networking, and though they are probably fixed at this stage, moving to Intrepid and Jaunty cured them. Most of my systems run Karmic. My point is that that stance makes one version seem un-stable, when in reality, it's stable. Development releases, they are the unstable versions.
But Ubuntu being an unreliable base, simply because of one particular printer? I've had no distro work "out-of-the-box" on as many systems as I have Ubuntu.
Disclaimer: I may be very biased, being an Ubuntu user 