OS X sucks at scaling. I still can't change global font sizes, so I have to rely on individual programs (and hope the devs did a decent job implementing font scaling in their app). Sure, I can scale the size of the dock, but that seems to be about it.

I remember in Windows, being able to adjust font/icon sizes, so I'm not quite sure I ever understand when people say OS X is awesome for scaling well and Windows sucks. Maybe most are just referring to the doubling of everything for OS X retina displays?