So I had a project where I used the CSS3 rotate, and the borders on things don't antialias very well. However nobody I showed it to noticed, only me. How many people actually notice poor antialiasing?
It varies; some people are highly sensitive to it, others not so much. It also depends on the exact characteristics of the physical display, since antialiasing is dependent on the exact configuration of the red, green, and blue dots in a pixel.