Welcome Mike Y - my first request concerning the graphics is the tint that is put on the games, especially night games and games in the rain. The 'blueish' tint is pretty bad. Specifically, fire up a night game at the Linc with the Eagles in their normal home green jerseys. It makes the colors all off - the frustrating thing is that it looks ok in the replay pane on the play call screen. It just takes you out of the game. I have played with my TV settings until I was blue and it doesn't help.
As for general presentation, I would love to see Terrible Towels and loonies in the Black Hole, hear The Eagles Fight song and E-A-G-L-E-S Eagles!!!, Hail to the Redskins, the Ravens band and all of the local color associated with attending an NFL game. If you can't get rights to everything, please, please include Custom Sounds so that we can upload songs and such. Custom Sounds is my favorite part of NCAA.
I would like to see teammates actually celebrate a big play, a few pats on the head or butt. Many lineman follow up to a pile to make sure that no liberties are taken and to help the RB up and pat him on the head, add this. Also for TDs, players don't just do their Hulk Hogan pose as everyone else jogs off the field. Have Brett Favre sprint to the end zone like a wild man, but have Peyton Manning just walk off the field. They are different personalities, different people. Make them different.
I would also like ot see some difference between games and the crowds that attend them. To use the current season as an example - the crowd in Nashville this week against the Steelers should sound different than the crowd at the 49er/Ram game. Also preseason should be different than regular season, and the playoffs should be even moreso.
Give the crowd some personality - here some boos after 4 straight 3-and-out drives. Amp up the sound on 3rd down, however some places should be pretty loud on all defensive downs. However, again, a crowd with a 2-10 team should not be the same as the crowd for a 10-2 team. I go to quite a few games here in Philly, there is a huge difference between games in August and games in December/January. A game against, say Seattle, feels different than a game against the Cowboys or Giants.