The problem that is occurring to Internet Explorer users (I used it for several years) is that they have no idea what they are missing out on, and how it seriously downgrades performance, quality, and speed. At the moment I have struggling with my website because Internet Explorer isn't understanding my CSS positioning making the website look all weird, and my website is dominated by IE users.
Personally, I think Google Chrome should have the top spot.
1st. Google Chrome
2nd. Mozilla Firefox
3rd. Apple Safari
4th. Opera
5th. Internet Explorer