Since the introduction of the grade system, which indicates how "good" a player fulfilled his role (that's how I understand it), I'm generally confused. But know I experienced a particular odd result and I really am in dire need for someone to explain me how this all works.
I played a round of ARAM and after the match I compared the grades of another player (of my team) with mine. Here are the (most relevant?) stats:
Total damage to champions: 8,928
Total damage to champions: 7,000
In summary I was better in every statistic. The only thing which sounds plausible to me as an explanation would be that the "difficulty" of a champ is an important factor in the calculations. Can anybody confirm this?
PS: I didn't even try to use the board search because I don't have the nerves for such a mess.