Well it shouldn't be. Anyone who says the player movement in Madden is realistic should lose all credibility in the conversation.
I'm sure that has something to do with it for some people, but you can't honestly say that we would still be talking about 2K5 if Madden was where it should be by now, ergo Madden failing to improve is what makes us still consider 2K5 to be great. Which is sad, because as spankdatazz said, it's ridiculous that 2K5 is still in the conversation of best football game in 2011.