Not a fan of world emersion and queuing to play!
I'm a founder of the game series but I'm not a fan of world emersion. Takes way too long to travel around finding the games I want to play then having to wait a few minutes in line to play! Not for me, I like to pick the game up, select which mode and start playing asap.
On a plus note some of games were good, 1v1, tennis etc (not sure about balloon). Having the ability to train your player up has been tried several times before but I like the idea of this one.
I'd like the idea of more real world training.
Select your training routines each week (additional weekly rewards) to target specific players (mainly young under developed ones) and those carrying slight injuries. Manage those players throughout the week in limiting game time and/or opportunities to develop further attributes (like evolutions) etc.