Don't use megapixel if subjects are moving - such is the implication of an independent international test program who warns that megapixel video subjects can start looking like a banana if they are moving. They claim their "conclusions from the results are fairly straightforward. Megapixel and HD cameras are great if the subject is not moving." This, quite clearly, fallacious assessment, is an unfortunate but direct result of the games that megapixel camera manufacturers continue to play.
There is nothing inherently blurry or problematic about using megapixel cameras with fast moving objects. However, manufacturers realized that if, by default, you slow the shutter at night the whole image looks brighter and displays less visible noise out of the box. Indeed, they quickly found that most naive users immediately concluded that the brighter, crisper image meant a superior camera (something our poll results confirmed).