I'm pretty happy with the current game, but things naturally evolve and get better. Aside from as many bug fixes as possible, here's a few things I'd like:
1. I'd like there to be a purpose to your wage as a manager. Maybe being able to invest it into the club's transfer funds or even buy a football club.
2. To be able to set certain tactical roles based on the actual players, and not the formational positions, which would stop me having to change player roles every time I rotate or make a sub. So, you might have Drogba up front playing as a target man, and then sub him for Walcott who will still be playing as a target man until I change it. I think you should be able to give each player in the squad a set role the tactics automatically revert to when they play.
3. I definitely want the AI to sharpen up. For example, opposition managers keep taunting me with "maybe mid-table if they're lucky." This despite me being 20pts clear at the top with fewer than ten games remaining.
4. The amount of **** players agents offer to me.
5. For players to stop demanding a new contract when I reject a transfer bid for them.
6. For there to be a way to tempt players who aren't interested in joining your club. Maybe let us at least give them an offer instead of immediately telling us their client's not interested?
8. And basically just as many more options as possible to keep the game fresh for longer. So more press conference questions, more reasons for players missing training, more player interactions, interacting with fans, etc etc etc.
Most of these are reasonably small changes that I think would help the game run more smoothly.