Haaahaha!
Champion mastery is live, and it's as bad as we expected. SR is finally getting a taste of the toxic noobish behavior that comes tied to personal score. Granted the noobishness is not as bad as the point-sitters we had to deal with, but they do get the CoD-kiddie KDA buffering toxicity.
We've been asking for years to remove the score system, but instead of listening, they've gone and unleashed the monster onto the SR community. Good. Once their playerbase shrinks to the 10% capable of understanding how meaningless score is in the face of overall progress and team-play, maybe the remaining Dominion community who realized the same thing over 3 years ago will look bigger in comparison, big enough to get actual support for our map.