I don't know why Nintendo fan's would be offended ( or even notice articles like this for that matter) unless there's some truth to them.
The Wii is the strongest Hardware seller , Software seller basicly everthing seller out of the 3 , Nintendo are making billions of dollars , everyone seems to be happy with Wii-Play and Wii-Fit esque games.
So what's the problem ? people are always eager to criticise successes , it requires a stronger show of intelligence.