the thing is with the defending in F12 is that everyone is learning it at the same time, so when playing online it's not too difficult. But i was used to playing my seasons at legendary and world class - so i'm getting battered trying to master the defending against the CPU at those levels.
One thing i do like is where you can have a player running with the ball and all of a sudden he pulls up holding his hamstring or something, there's also more players getting injuries which is more realistic - so you can have 3 or 4 main players out at one time - which means you need the squad rotation system to work.