An aspect of the game they have not addressed/fixed at all and it's almost game-breaking for me. AI response to a loose ball. I can't tell you how many times there's been a loose ball that my player can EASILY get to before the opposing team but they immediately back-pedal and retreat to defend. It was one of my biggest frustrations in FIFA 12 and it's continuing to be my biggest frustration on FIFA 13.
By the way, World Class doesn't even feel fair, I honestly feel like the game's results are predetermined. There are some games where no matter what I do, I cannot prevent them from attacking and scoring. Other games they never get a sniff at my goal, and it's not like it depends on the team I'm playing against. I played the worst team in the French league in a game in my career mode and they did whatever they wanted, there was nothing I could do to defend them. I have a serious love/hate relationship with this game right now.
By the way, World Class doesn't even feel fair, I honestly feel like the game's results are predetermined. There are some games where no matter what I do, I cannot prevent them from attacking and scoring. Other games they never get a sniff at my goal, and it's not like it depends on the team I'm playing against. I played the worst team in the French league in a game in my career mode and they did whatever they wanted, there was nothing I could do to defend them. I have a serious love/hate relationship with this game right now.