De-ranking from Diamond to Platinum needs to go
Diamond as a tier is pointless after the addition of de-ranking. If you're a Diamond tier player, you now spend 80% of your time pushing out of Platinum only to get de-ranked again once you start fighting Crystal players. The skill gap between Platinum and Crystal is huge. How are you supposed to learn to play at a Crystal level when you spend all your time fighting Platinum/Gold players?
It's demoralizing to need to go through NINE (9) tiers with no checkpoints. Diamond tier players are churning out of ranked play because it's impossible to make any progress. I've spent well over 100 games now ping-ponging between Platinum 2 and Diamond 4. I've pushed all the way to Diamond 2 a couple weeks ago. Tonight I made it to Diamond 5 three separate times only to immediately get de-ranked to Platinum 1. It's no longer fun anymore. I'm on the verge of churning out too.