Well, as someone who only uses Windows when he has to, I'd say IE10 being the default browser is pretty exciting. Win7 ships with IE8 so people may or may not upgrade. With IE10, it's "HTML5" in full force.
I fail to see your point.
IE10 looks like a great improvement but only when compared to itself. Even current Tablet/Mobile browsers seem to have far greater support than what IE10 will give!
IE10 isn't even close to done. At any rate, see the huge jump in HTML5 compatibility? IE raising the bar so much is a big win. In many corporations, IE is the only browser that people care about. Becoming more compliant means it's easier for developers to write "standard" web apps.
http://html5test.com/results.html