So I just played a ranked game with Jhin 
and went 15/4/14 with decent cs and 35k damage to champs... and got a pentakill XD. Still got an A+, so I was wondering what the real requirements are to get an S as it seems nearly impossible to get one as an adc.
Thanks
sometimes losing and bad cs for adc leads to below S grade. Riot also said they may in the future release more specifications on what makes higher grades, but they're worried it might make people do silly plays just to up their mastery.
Getting an S rank is basically just reading the situation on the map and saying I want that xp + gold over being in a forced fight and wasting 1-5 minutes drawing the enemy in. All it accounts is 1. efficiency of abilities. 2. XP/M + GP/M 3. Result of impact with team.
Play under used champs like Vayne Varus Urgot and Corki and it's easier to get an S grade. Smaller pool of players to compete with.
But when you play popular chamsp like Jhin Ash Cait or Kalista you are competing against a larger pool of players.
They compare your score with other players scores with the same champion/role.
It's probably because you had the warding trinket ALL GAME, and only placed 5 wards. And also didn't buy any pink wards :^)
