Well on certain champions it would be cool to be able to see your influence on the game. I've been picking up Nunu jungle again and played him as a main in season 3. I do shit all for dmg to champs each game, but a lot of games the ADC will be like twice the damage of any other carry in the game including the enemies, or at least a bonus 50% compared to the runner up in damage to champs. I know a big chunk of that damage is contributed by all the extra autos they get in bc of blood boil, but there is no representation of my influence.
Same thing w/ a 5 man nunu/amumu/any other aoe ult that can win a team fight but may not result in any multi kills for you unless it's like holy-hand-gremumu build w/ full AP Amumu and no resists.