Earlier quoted context omitted.
It's mostly style that's the problem. IE8 is better but you don't get any niceties (rounded corners, etc). IE9 looks like it will be marginally better (eg, you now get rounded corners, but not much else).
Why is it that people should expect home pages to be the same pixel-for-pixel between different browsers? As long as the functionality is there, why do a few rounded corners matter?
Well, it's not only about style. IE9 adds rounded corners but still skips a lot of modern features in HTML5 that simply can't be used reliably by anyone due to IE not supporting them. IE is like a over-turned transport truck across 3 lanes of the highway to a better web. They cleaned up some of the spillage, but... well we're still not going anywhere :)
Styling is the most obvious issue, but it's just the surface of the problem.