My finding is it has been a long time since ClearType in Vista beta. At that time The font smoothing in beta was so scaring. Lucky Microsoft can fixed it in final with also IE 7. IE 8 beta also has the same problem. Once again Microsoft fixed in final. But that did not happen with IE 9. IE 9 grey font rendering is so bad that I can stand it. I am a power user old guy. In the old time PC was expensive. That's way many trick to speed up Windows is useful. Like don't use wallpaper, etc kind. One trick that effected in this problem is "use best performance" especially the "disable font smoothing". I have been using Windows 8 Pro X64 RTM for a few months with "best performance". I use Opera, Chrome, Maxthon, Firefox just fine with text rendering. Other program that use MSHTML or IE Engine like Google Talk, Yahoo Messenger is blur text.
I use from Athlon II X4 640 to I5 3470 with HDMI Geforce GTX 460 on Samsung BX2250 and latest driver 3.14 etc.
If you want more dramatic effect event try launch "Adjust Clear Type Text". Randomly check and uncheck the "enable clear type" a few times. And your windows font will be horrible event if you close that apps.
I hope this will attract world attention.