The amount of mastery points you lose for losing the game is absurd
When you do well and put up a good fight but lose because the enemy has done a better job ( Or unforeseen circumstances have occurred) the amount of points you gain is mockingly low, If I have had a bad game and don't get so much then that's understandable, the system is meant to rate you on your performance, but if I do my best, I do well, but we just lose in the end, get a score like S+ and only gain 300 is a major insult, I understand if you lose then you may not deserve as much but sometimes both sides can play equally as well and one side just gets a good team fight off etc, this needs to be fixed and made so if you do well but still lose you don't feel like you've just 100% wasted your time.
TL;DR: If you lose the game but still do well you should still get champion mastery points reflecting that.
Completely off topic: You can do bad and win and still get high points.
Normally I'm not one to care if a post of mine gets upvoted or downvoted but I'd appreciate if you upvoted so hopefully someone on Riot sees this, it's not unlike riot to take in community suggestions.