Tell me what to do in order to get an S.
Sometimes when I play a game and I play and do really well, I won't get an S rank. I think it'd be cool to give tips in the post-game menu that say, for example, "You should try warding more!" or, "You should try to get more minion farm."
This would allow more inexperienced players to learn the game quicker and perform better each game. So if a player cares about his/her rank, then they can learn from their mistakes (if they weren't already apparent) and become a better player.
I think this would be a pretty easy addition to the game, and it would be pretty helpful to those that want to play at their best.
Knowledge
is power, and power breeds victory.