First, IE9 doesn't fully support mature HTML5 and CSS3 standards. Congrats, the only tests you pass are the ones that your own department submitted to the W3C. Everyone else's show IE9's Release Candidate as having less support than other browsers released 1-2 years ago.
Second, nice job cherry-picking a single paragraph out of one of the few comments in the Hacker News thread supporting your position. You also conveniently omitted the scalding final line of that paragraph: "It's just a shame they're not providing it on XP." This is typical of your response in general: you've responded to absolutely 0 of the actual criticisms of your product, and instead decide to praise the few improvements you happened to make over IE8.
You're only providing your new browser to a small fraction of the OS market, it still doesn't support stable and mature spec features, the ones you do support are still wildly broken (canvas, ahem), and you remain silent through it all.
I had high hopes when you initially announced your plans for IE9 all those months ago. It's a damn shame they turned out to be nothing more than marketing smoke and mirrors.