"Basically in games you do not have natural occurring motion blur, you see each and every frame clearly so therefore notice the transition between frames allot more easily, mainly in fast action first person games that require you to pan the camera (your point of view) around quickly, company's have recently learned that integrating motion blur into games to emulate what you see on TV or the Movies and can help give you the impression that you are getting a more consistent frame rate, like in the PC game Crysis for example, many people found that even at around 25 frames per second the game unlike many others at this frame rate was quite playable, this was due to the clever implementation of the motion blur, I think once game engines become more advanced and they can be programmed to emulate motion blur more intelligently then the need for such high frame rates in games will not be as important, the problem with computer games atm is the way in which they show you your environment is too perfect, even in real life with using your very own eyes when you pan across to view something quickly you have motion blur."