i see many things that could be improved there.....
1) Most important is the AI, the players controled by computer are very stupid and predictable...if that improves I believe beeing a part of the team in BAL would be very enjoyable
2) Training should definetly be much more then just playing games....i think we would enjoy some sprint chalenges or have some passing games (like those challenges in training mode from main menu), freekick challenge.....and using those we could improve our stats, not waiting for a match to get a freekick so you could improve in that, if you want to practise that you will get a chance
3) to play as a defender, r/l back, goalkeeper.....and be properly awarded for tackles, interceptions, clean sheet....not only goals and assists
4) many additions not related to match playing.....like spending money you earn, they could add animations of cars,houses...which comes with money and fame
or singning a sponsorship contract that tells you which boots you should wear....
5) adding some more animations instead of just showing pictures, like presentations when you sign for a new club, give interviews, sign autographs...not just the animations when you retire or get the ballon d'or
i know i'm asking allot i would be happy if only one of those things end up in the game, but i hope you agree with me