Not wanting to start a caliber war so lets not go that route.
Was skimming through an AR-15 book at Borders yesterday and saw something that caught my eye. The author said that most problems with 5.56 "stopping power" comes at close range and and long range. I can understand about the long range bit, the little round has just petered out and doesn't retain alot of energy. But what are the problems with the 5.56 at close range? It seems to me that at close and medium range it is a pretty dang effective round.