IE8 is a definite improvement over IE7, which is a monumental improvement over IE6.
But yeah, IE7 still has lots of weird bugs. And from what I've read, the IE9 team still has no interest in rendering the Acid3 test properly.
Visit
http://acid3.acidtests.org/ in any browser, and IE will always do the worst. Even compare something like Firefox 1.5 against IE8 and I believe it still does better.
And like you said, the good news is that Firefox is actually the majority on all the guild sites (at least last I checked it was like 52% firefox), so that tells me that, in general, DKPSystem.com users are savvier
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It's all in the reflexes.