1)Well gang tackling was a big step, it was in 2k5, when did Madden and NCAA get it?
2)Animations are better like when a running back is running through a hole and its kinda tight he will move his body to the side a little to squeeze through, thats attention to detail.
3)Commentary was better in 2k5, it flowed better with the game, yeah there was some problems but it was a lot better. This is my opinion.
4)Weekly practice and the way it worked was really nice and realistic, yeah some people may not have liked it or even hated it altogether but it was mostly because they couldn't find that nice mix to get your players the boost in stats you wanted, added a little something to the game.
5)Custom music for stadium and game situations, it was so nice to sack a quarter back and hear "Another one Bites the Dust, Moma said knock you out!" or whatever you wanted. Guess this may go with presentation but it was really nice.
these are just a few, some may like I said go under presentation, but its still a shame that a game back in 2005 had so much compared to what a game today has. Maximum passing has been in 2k for a long time, how long has Madden had their version of it?