I love the idea of Champion Mastery but...

Why the heck is it so contingent on team win? I finished with an S- on Warwick, despite my team losing pretty hard and only got 270ish points.

As oppose to an S+ on Nautilus and I got over 1k points.

I get it's a slightly higher grade, but that's such a ridiculous difference in how much whether you win or lose impacts whats suppose to be about your performance on the champion.