Granted, they play very similar but they FEEL very different. I think the main factor that accounts for some of the same people that love NCAA 11, hating Madden 11, is because of immersion. NCAA 11 does a much better job of giving the gamer a feeling of playing collegiate football than Madden 11 does of playing in the NFL.
I think that's also why so many people look upon past football games so favorably. When people are frustrated about past features missing, they are frustrated about missing how those past features help immerse them in the game. Graphically, next-gen football has blown last-gen football out the water, as they should have but immersion wise, not so much.
The more immersion a video game can provide the gamer, the more likely it is for most gamers to miss and/or overlook that games short comings.