Madden NFL 21 is Madden NFL 15 that was pushed out the door and renamed to Madden NFL 16 that was then pushed even harder out unto the side walk and renamed again to Madden NFL 17, that was then shoved so hard it stumbled and was renamed to Madden NFL 18 and while it was still stumbling from the shove it was renamed to Madden NFL 19 and when it was unable to keep its balance and fell, it was quickly renamed to Madden NFL 20 just before it hit the ground, then, as it laid there twitching and drooling from smacking its head on the curb, it wasn't even checked to see if it was okay, if it needed any help, nothing. EA simply walked up and whispered in its ear "Your name is Madden NFL 21 from now forth".
Its a buggy, broken and hopeless football game that was repackaged (basically a glorified roaster update with a name change, quick UI respray and well refined ultimate team) then presented to gamers for $60. Keep your money and stick with Madden 20.