I understand the concept, but I don't know any other ladder that does this.
MMR System
Low MMR vs Higher MMR, you lose game. You don't deserve to be here PUNISH lose more MMR.
Low MMR vs Higher MMR, you win game. You don't deserve to be here PUNISH gain small MMR.
High MMR vs Low MMR, you win game. You are too good REWARD gains big MMR.
High MMR vs Low MMR, you lose game. You are too good REWARD loses little MMR.
WHAT?! If the system deems you as good, even if a "Wood5" beats you, you don't get punished for that off game. But somehow beating a bunch of "baddies" boosts your LP like crazy.
I get it may help Challengers get out of the lower tiers quickly on win streaks. But for EVERYONE else it makes no sense. You get punished if a worse player beats a better player WHAT.
Every other ELO system balances your gains/losses with your skill vs enemy skill. MMR just says your skill is good or bad and ignores who you beat. And the only way to fix your MMR is to streak until it stacks against you.