I'm a Windows guy temporarily using a Mac to write an iPad app, and the main thing that bugs me about OS X is how fuzzy the fonts look. In Windows, my fonts look ultra sharp on-screen; on Mac, fonts look fuzzy. Apparently it's because of this: http://www.codinghorror.com/blog/2007/06/font-rendering-resp...
But I say to Apple: unless one's monitor has the dot pitch of the iPhone "retina display", your font rendering looks really fuzzy. <rant>What good is "preserving the typeface design" if it makes your eyes water?</rant>
So yes, this is quite subjective.
It really is a matter of taste and what you are used to. Also because antialiasing is basically a trick of visual perception, it wouldn't surprise me if there really are differences in people's vision systems such that some people are more likely to see heavily antialiased text as blurry, similarly to the way some people are more likely to object to low framerate video or get a headache when viewing stereoscopic 3D.
I recently found that one can go into Options in Visio and change font rendering so it uses gray-scale. Then the kerning is just fine.
No matter how long I use font aliasing, without some very high dpi my eyes just cannot adjust, cannot totally ignore the bluriness. Seems like I'm in the minority though.
Basically, the OSX font rendering is as close as they can to print, where the Windows font rendering gives primacy to on-screen font clarity. This leads to a "fuzzier" OSX look, but a much better match to the actual typeface where windows's renderer "breaks" fonts to make them "clearer".
This, of course, comes in no small part from Jobs's background in loving the written/printed word. I'm sure it's also helped by the Mac background/history in design and print.
Comes down to taste.