Never cared much about the grading system (it doesn't tend to reflect actual contribution or performance very well) but can someone explain how this isn't an S+? (ARAM victory)
I am guessing (don't know) that a few things are at play here: As noted, your CS is not that high (even for an ARAM). Also, because you didn't die, you never got items. I assume that your damage is actually fairly low (relative to your scorline). If you are chasing those S+ you should probably execute when you hit item break points so you can buy items and deal more damage.