According to my understanding if pixels per inch are increased on the screen, the content should only look better.
Now when I use my Mac I see a lot of programs which have blurry text when viewed on a Retina display. Why does every app need to be updated to work with retina display on mac?
Edit: I wanted to add something more interesting, if you install Windows on a mac pro retina with all the latest drivers it would look absolutely gorgeous. The Win7 drivers support retina display really well and I don't have to install applications on Win7 that support retina display specially.
So I feel that it is something which which is only done by OSx because everything works fine in Windows really.