I know this is a bit of a necro-bump, but I tried All-Madden in Madden 08 for the first time... and I wanted to rant on it a bit. The reputation the mode has is 100% justified. Examples of how the game straight-up cheats:
#1 - DBs will suddenly stop covering. This happens on All-Pro sometimes, but the degree of it is astonishing. A CB will suddenly start slowly walking the opposite direction of the WR he's covering for no reason.
#2 - DBs will suddenly lose 30 speed. 95 spd CBs will be routinely outrun by 85 spd WRs. And it's vice versa - I documented a 82 spd LB catching a wide open 92 spd WR out in the open field, when there should have been no way even if the LB was 92 spd.
#3 - Sometimes your defenders will just refuse to tackle a guy and will just stand there
#4 - CPU defense will make unbelievable pass knockdowns. This will include DBs sliding across the field without moving their feet to get in perfect position to break up a play.
#5 - Your WRs and TEs will not "attack the ball" when thrown to, and will wait until the ball reaches them. This leads to many interceptions simply because the DB makes a jump towards the ball, and the receiver simply sits there and waits when he easily could have made a contested catch.
#6 - Tackles will occasionally phase through CPU players. On a runaway play, you will find that when you dive to tackle the guy, your player's arm will phase through the CPU guy's leg/body without impacting him.
#7 - There were a couple rare instances where CPU receivers would catch passes even though my DBs had a hand in there. The DB's hand literally phased through the football and the receiver's hands.
Oh, I found an example:
So yeah, just wanted to go off about that. Don't play on All-Madden unless you want an unfair challenge!