Everything > 30 FPS is nearly impossible to recognize for the human eye (i.e. too fast). That is the reason, why most movies are available @ 30 FPS or less. The european norm for the framerate in movies and other TV productions is 25 FPS, and i heard not many complaints about this framerate.
*sigh*
You don't know what you're talking about. Movies are acceptable with only 24 fps because each frame has motion blur by definition...1/24th of a second is captured by each frame...including any motion that occurs. The illusion of motion is possible starting at around 18 fps if motion blur is included. If you were to turn your head while watching (against the motion of the source), then the illusion would break at 18 fps. The 24 fps of film is considered a "safety" point.
30 FPS video (TV) sources are the same way. For that matter, so are 60 FPS video sources, although there is less visible motion blur because there is less motion captured per frame.
Unless motion blur is being applied by the game in question, 30 fps in a game is NOT the equivalent of 30 fps of video or film...
The human eye can recognize disturbances in a frame rate as small as 1/200th of a second. (if a screen flashes an image for only 1/200th of a second, you would not only recognize the flash, but also be able to identify the image itself with some considerable detail).
The realistic limit for motion recognition is somewhere between 60 and 100 fps without motion blur, depending on the person, and depending on how "stable" that frame rate is. The average person could recognize a difference between a 60 fps source and a 120 fps source on a screen that is refreshing at 120 hz. The screen's physical refresh rate is, ultimately, the maximum "necessary" fps for a game or any other source. There is no difference between 50 fps and 15000 fps sources when displayed on a screen with a 50 hz refresh rate.
Most LCD monitors have a redraw rate between 60 and 240 fps. With a fast-motion source (like a camera panning in a TV show, or a video game, for example), the average person would be able to easily see the "stuttering" of a 60 fps display when sitting next to a 240 fps display if both are playing a source that is significantly faster than 60 fps (120, for example).
Play SC2 at 30 fps and then play it at 60 FPS and you're going to see (and feel) a difference.
macbook pro dude...