For everyone complaining about IE not being horrible, yes, it's not horrible anymore. IE 9 is decent. however, it is not great like Chrome, Firefox, Opera, and many derivatives of FF and Chrome. IE is less stable than FF, Opera, and Chrome. IE is usually slower, but in this context, it often isn't enough to truly make much difference. However, IE sometimes is really a whole lot slower. Fortunately for MS, these aren't very common situations for most people, but they are considerable. IE is at or near the bottom of performance charts far more often than the other browsers that it's up against. IE9 isn't horrible, but the alternatives are better.
What you do with your web browser can make the differences between the browsers more pronounced in some situations. It's like graphics cards and CPUs, you use the browser most suited to your needs if you really care about that. I have several browsers for different situations including Palemoon (performance-optimized Firefox), Comodo Dragon (security and slightly performance-optimized Chrome), Lunascape (has all three of the most common rendering engines Trident (IE), Gecko(FF), and Webkit(Chrome, Safari)), and Opera.
I have add-ons like Ad-block, fasterfox, and several others to get more performance and security out of the system.
Now more on topic for the article, pretty much all market share data could be called misleading. Is MS in the wrong for saying that a certain statistic is misleading? no. However, like any other company, they don't publicly admit that EVERYONE regarded here is either wrong, misleading, or both.