Alright Ballplayer. Here's my arguement.
The tendency system would not really work for Football. You can't really make player tendencies because what a player does during a play is usually dictated by the way the play develops and the playcall itself. If the play call is an 08 Toss in the I-Formation(outside run toss) the running back is supposed to run out to the sideline full speed and then try to turn it up-field. Now, if the play develops in a way where he can cut it up immediately, the RB will prolly take that.
Next, situations on defense. If there were tendencies on defense, there would be more problems caused than there already is. First off, sometimes a defender will hit a ballcarrier in a certain way no matter what. If the ballc. is running towards a LB on the goal line, I doubt that LB is going to stand there and let the RB hit him so he can wrap him up. That LB will throw caution to the wind and try to blast(hit stick) that Ballc. so he won't get any extra yards. That's why you see so many missed tackles on the goal line.
Next with coverage, many times a CB of Safety chooses how their going to interrupt the pass depending on their position. Say a CB like Asante Samuel is playing zone and a WR jumps for a highly thrown ball four yards to the left of him. Even though Asante loves going for the pick, I doubt he is going to break on the ball and try to jump in the air for the pick risking the WR catching the ball with him still being in the air. Asante will break on the ball knowing he can't get the pick
and probably pop the WR up high or flip the WR by going low. If you put tendencies in Madden for a situation like that, Asante will stupidly try to go for the pick, the WR will catch the ball, land, and continue his journey to the endzone without Asante instead of Samuel just making the tackle then and there.
Also, if a team is down plenty of points, CBs may start jumping routes alot more often.