I think medals are a great idea, I would just like to see more objective based medals added into the game, as other have already said.
Things like healing a ball carrier, attacking a ball carrier, etc...
I definitely plan on going back on doing as many missions as possible with my main character. However, I don't want to go back and do a dozen lower level missions at this time, and my mission log is full and making it complicated to obtain current level missions.