End-Game Rating system is trash.
Seriously.
For my latest (and second best) example:
I just got out of game as the ole reliable 
My score: 0/3/25
Doesn't get much better than that for a support. That's 64%~ish kill participation. With only 3 deaths! Now maybe you're thinking "You must have gotten an S! Or at least an S-!"
And you'd be WRONG because I got an A (Now sure, this isn't a bad rating. But it's far less then what the score indicates I should get!
Now maybe you're thinking "Maybe you died more times than the rest of your team?"
Nope: Here is my teams death counts 4/8/1 16/6/6 13/6/4 6/4/18
Uhm? Excuse me? I have the least deaths on the team the most assists by far and you're giving me an A? That's it? How about a more extreme example!
A few games ago (Like 20+ games ago) I was playing Kog'Maw. I went 11/0/5 PERFECT SCORE IT DOES NOT GET BETTER THAN 0 DEATHS 11 KILLS AND 5 ASSISTS.
What did I get? A freaking B are you kidding me? A B????
This system has been broken for a long time always giving the best scores horrible grades and only giving good grades once in a blue moon even if your score is fantastic. It almost seems random to me at this point.
Then it occured to me... Well what if it rips your score down if you don't ward a lot? That might be it! They give so much credit to warding lately maybe it is!
(hahaha no)
Because In the 0/3/25 game I placed 16 wards total for the entire game. (granted I usually place more but oh well) That's still 2 higher than anyone else in the game and the Kayle on my team that got a S only placed 10.
So what is this obscure seemingly random and inaccurate rating system? Can someone explain this to me?
[zombie-brand-facepalm]
For some reason the site won't let me hit the "post discussion" button if I "add a poll" so if you want to vote on a poll you're gonna have to go here:
https://pollev.com/wiredfish238?_ga=1.263682892.1578018886.1459394513