It took me several months to get used to it... Really bad in some fonts.
Single biggest flaw in Windows 8. If I could buy monitors at 4K resolution, I'd let them off a bit. But with desktop monitors hanging around 90DPI still, we need ClearType.
Problem is, even if there were cheap high-DPI monitors available today, the experience of using them on Windows would be sub-par as MS has made zero improvements to DPI scaling for desktop apps in Win8.