How didn't I get an S rank here?
I was playing Amumu in the jungle in a draft game with four friends that lasted just over 53 minutes that was very close. We ended up winning and by the end of the game our team had a total of 33 kills and the enemies had 23. I went 5/1/25 with 210 CS, participating in 30 out of our 33 kills. I ended up with the highest damage taken, healed, and fairly decent damage dealt to champions for a tank (23k if I remember correctly). I ended up getting an A+ while two of my friends (Vayne, 9/3/12, 425 CS) (Shen, 13/3/13, 365 CS) got an S- and S respectively. The only factor here that I can see is the fact that I didn't get a lot of CS for a 53 minute game, but as Amumu jungle who builds like a tank (with maybe a little bit of AP) I don't think it should expect me to get 300-400+ CS. Especially by late game, my damage ended up dropping off considerably and pretty much all of the minions were swept up by my teammates. I have an image of the end of game screen (I forgot to get the stats though). You can check my match history in-client as well. The online match history is just a blank white box for me right now, otherwise I would've just linked it.
~Rito pls