MSIE is still lagging far behind in HTML5 standards: http://html5test.com/results/desktop.html

While MSIE may be 'good' browser (tastes may vary, I find the UI horrible) it's damaging to the web ecosystem to have MSIE leading the marketshare. It's advantageous for Microsoft to limit new features and keep interoperability between browsers low. As a result the entire web using public loses out on having new features and having a broader choice.

Chrome and Firefox are built on open source software, so when an issue occurs you can participate in the process of it being fixed.