Madden 10 was a huge disappointment to me. If I wanted to figure out what the game was like I should have just played Madden 09. The only true differences were the music, the commentators, the way the presentation of the score, down, quarter and time you have left in the game. Superstar mode and franchise mode are completely the same. The only fun I had with it was in the practice skills tests.
If you want to buy this game, don't waste your money. Just play Madden 09 and imagine a different view and music. That's all.