The demo really dissapointed me. I havent bought madden since 08 and have been waiting for a proper physics engine. In short, the infinity engine seems inconsistent and unpolished. It looks like a bad version of the Backbreaker engine.
Considering I havent bought madden in 5 years the game seems to have the exact same problems that it always had:
The run blocking is terrible.
The pass blocking is awful - sometimes two blockers will miss the one huge dude who runs right past them. This forces the QB to scramble way too often.
Punt returns and kick returns have (you guessed it) terrible blocking.
Kickoffs, punting and field goals are still boring and unchallenging.
Screen plays are still inconsistent - with the reciever often charging horizontally out of bounds.
The general running animations look robotic and inhuman, with players turning and changing direction as if momentum and mass do not exist.
DBs still make impossible blind interceptions.
Every year I download the demo thinking, 'this is the year that I will get back into madden - like when I played the 04 and 05 versions for a zillion hours'. And every time, the demo feels rough and clumsy.
Kinda tempted to play ESPN 2k5 again...