Anti-aliasing is a important aspect of computer graphics. We must see it on graphics card frame rate per second tests, to see how much anti-aliasing one could afford to not sacrifice too much performance for visual quality.
Anti-aliasing is basically how ragged the border of an object is. High anti-aliasing means the object's border is rendered more, to look more realistic, where as 0 anti-aliasing means the object's border is ugly, and very pixel-ly.
Because of the fact that anti-aliasing costs so much of graphics card process power, it is important to design the game such that it doens't look horrible at 0 anti-aliasing. Not everyone has the best 1000$ graphics cards.
Real life objects will look like 3 pixels, or 5 pixels, if the field of view is high, so it is important to not make those objects bigger, and simpler in shape, so it is easier to see, and not so pixel-ly.
World of Warcraft has done a great job of not adding too much detail that would be totally eat up by 0 anti-aliasing.
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