Make ranks more visually seen, ppl work hard for their rank and are proud of it. You should be able to click on your friends list and view their ranks. Also maybe when looking at the scoreboard have everyones ranks next to their name since you we get to see your opponents ranks at all and only your teammates at the end of the game.
Also the ranks are cool but maybe have the roman numerals outlined or in bold they are sort of hard to see.