I've been looking at a lot of video lately of things that the NFL 2k series does better than Madden. I posted a lot of videos in my blog. Anyway, I came across this video where Versuz (of youtube fame) made a video of NFL 2k5 and updated the rosters then made this a 2k11 trailer. Obviously the graphics aren't there which is why I look at it as an alpha build or a early build of a future game. But there's so much going on, so much detail that Madden doesn't have that I have to admit that with a new coat of (graphical) paint and a roster update, you could actually have a NFL 2k11. (if not for the NFL exclusive rights agreement.).
take a look...
http://www.youtube.com/watch?v=vZRR_gM5dcc
take a look...
http://www.youtube.com/watch?v=vZRR_gM5dcc