idk if this happens in high elos. But in low elos (which i am in) people afk farm for 10-15 mins to get their S rank. Can you please change how S rank is given? If a player has 6 deaths he shouldn't get a S rank with only 10 kills and 2 assists just because he afk farmed for 15 mins.
Farming well is the most important thing you can do to get stronger than your opponents and win games - hands down. Objectives are important too - those dragon buffs really add up. There is more to this game than just getting player kills and having 0 deaths.
ranks are based off of a certain percent of players' performance
