Make your Ranking system more transparent, please.

It's becoming rather infuriating to go into a game where teamwork is key and not get an S for playing with the team.

Perfect example: http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2293926256/32252032?tab=overview

Our team kept just shutting down theirs to the point that it was a 4v5 and we would win. While 4 of us were team fighting, Vayne would push other lanes.

Who got the S? Was it the support that helped the teamfight? No. Was it me as the APC? Of course not. The jungle? Nah. The solo Vayne did though!

The reason this bothers me: if we didn't actually keep the rest of the team at bay, Vayne would not have been able to push those turrets.

Do assists actually matter? What about turrets and inhibs? This question needs a straightforward answer, because right now? Teamwork- actual teamwork- isn't being rewarded. It feels more like people don't want to go into teamfights if their KDA is affected.