I've tried every major browser, and IE9 is the only one that's unreliable - no other browser shows 'webpage is not responding' so frequently on routine sites. IE's rendering model is also very irritating - e.g. I'm booking a flight and I see a message - "IE has blocked a popup, click here to ...". Try to open the popup and it does a full refresh of the page losing your state and the information you had, instead of just opening the blocked popup. Then there's the stupid 'allow all content' error message. I know what it means and how to disable it, but the message gives no meaningful information, and ordinary users shouldn't have to make these decisions. With IE10 Microsoft is pushing Metro which means even less usability than the current UI. I really don't see anything IE does better than other browsers other than the fact its built-in.