In my opinion, glare/glossy type screens would be better on smaller screens, like 13inch and smaller, especially for portable devices, it will be easier to view and usability is not sacraficed otherwise. For 15inch and bigger screens, if you're working on it for a long time with graphic intese duties, and needs accurate vision of color, and not distracted by other things, and or even just normal usage, the AG screen might be better.
AG in my opinion only helps in direct sunlight, as to I agree with the sharper/better colors with glossy screens, for in a complete dark room you see no reflections, etc.
AG would be a great upgrade option for 15.4 and 17inch macbook pros. You don't see professional monitors with glossy exterior, do you? Same point.
Then again, this is all just personal preference, no need to nail it, pin point and gave it a defination. I personally prefer anti-glare type for the simple fact that I am used to it (as in not used to seeing reflections, faces etc, when I am working and trying to focus), and the macbook pro AG screen option provided is certainly better than the default/stock ThinkPad ones (T, R, W series) that doesn't even have a glossy option.
and to the thread poster, Dear Bobby: IT'S NOT A MYTH, LOL