A- I dishonored my family!!!!

I was playing a game of just SR normal blind pick and i was doing fantastic; no deaths 2, assist, most kills and better than everybody else. They surrendered and at the end, my score for jinx (the champion i was using) was an whopping A-. I dont know if im being overly dramatic but i think i atleast deserve an A+. Anyone else feel that they got a score that didnt fit? Or feel for me that i should have gotten a better score?