While I would be incredibly happy to hear that IE switched to webkit. 95/100 is a great ACID3 score. And they explained why a few of the points weren't made. ACID3 just tests things that browsers usually get wrong. Not necessarily things that are in that high demand to be used by Web Developers.
IE9 is an amazing step-up from IE8 so far and I think we should all be patting them on the back. I'm sure dealing with Microsoft policies and playing catchup to the other browsers is no easy task. And the team is doing a great job trying to modernize IE9.
My boss screamed at his phone today. I wondered if he realised he'd just set all the employees on edge and lost maybe 2+ person-hours of work for the rest of the day - traded for the momentary release of an angry outburst.
Similarly, your boss might have been technically correct, but a boss who would rather be right, make a point and potentially knock your morale, than boost your morale for free should really be rethinking his approach, IMO.
It's funny to see them making those remarks regarding Acid3 and having "tests" result on the same page showing how IE9 is has the best support for HTML5, CSS3. (Hint: it's best at passing MS tests, some of which are really obscure).
IE9 is an amazing step-up from IE8 so far and I think we should all be patting them on the back. I'm sure dealing with Microsoft policies and playing catchup to the other browsers is no easy task. And the team is doing a great job trying to modernize IE9.