Champion Mastery Grading System Needs to be Updated

I did Nidalee things. Shouldn't abusing her early game, taking every drag, successfully ganking each lane individually, ending with an 8.00 KDA, and destroying their nexus at 20 minutes be MORE rewarding or AT LEAST the same reward as a lengthy ass back and forth game with obviously more global opportunities? I get an A+ in this game, and I know I only have ~50%+ kp, but it's for sure annoying when I have 1 more S+ game to get level 7. Idk.... anyone else experience this?

EDIT: Down vote me more pls. At least it's constructive rather than flat out complaining. Cancer boards.