Support Mastery Changes
As a support who's given it PLENTY of time and work since the "change", the new mastery weights are bullshit. Nothing has changed. I lost a game where I went 7/5/33 and got an S, won a game where I went 8/8/37 got an S+ and won a game where I went 1/0/22 and got an S-. I had a significantly higher impact and kill participation in the last game despite the lower score (89% kill participation). Whoever gets more kills gets the higher score.
It feels like nothing has changed in regard to support weights. Damage shielded, wards placed and destroyed, healing done, stats like this really should help determine ranks, not simply a kill fest game in which the other team didn't surrender @20 (which is usually the case in games capable of producing an S ranking or above.) Another thing that irks me is that when a game gets cut short you can't really get S+ rankings because not enough kills happened by 20 minutes, so an S+ performance gets an A+ or S-.