I don't know that I'd call IE6 "revolutionary", but it was indeed an excellent browser for its time. As terrible as its standards support was compared to later browsers, it was exemplary for its time.
But it's impossible to ignore the way Microsoft reacted to winning the browser wars by shuttering the IE team and leaving web standards effectively adrift until Firefox came along and starting taking market share. Whether you call it reprehensible or want to call it a "good business decision" that just happened to be bad for consumers and the web, that will always be the legacy people remember about IE6.
But it's impossible to ignore the way Microsoft reacted to winning the browser wars by shuttering the IE team and leaving web standards effectively adrift until Firefox came along and starting taking market share. Whether you call it reprehensible or want to call it a "good business decision" that just happened to be bad for consumers and the web, that will always be the legacy people remember about IE6.