1) take a look at:
http://caniuse.com/
2) You are missing the point... what I'm saying is IE renders shit differently than every other browser... e.g. something can be coded and will look fantastic in every browser BUT IE. So it forces developers to have to do separate things for IE to make them look correct. For example if you want rounded corners you have to make little images or some BS hack to make it work correctly rather than using the CSS3 property border-radius...
3) It's not my opinion, it's a fact. IE supports less standards than every other major browser. IE renders HTML the slowest of any browser. IE has the slowest JS parser of any browser. These three things comprise the core performance and worth of any given browser as far as accessing, parsing, and displaying "web content"... Not to mention they update less often than everyone else... So I'm sorry, what exactly makes IE good? What are the pros exactly? The vast majority of people still using Internet Explorer are the ones that don't know there ARE other browsers, the rest are ones that don't understand how far behind IE is than every other browser... The only reason it's popular is because it comes with Windows... seriously.