I have 2500+ games logged. I got my first punishment about a month ago. It was in a ranked game, where I was playing safelane melee-carry against two ranged harass heroes. A Peruvian last picks Pudge on my team and goes safelane with me as my "support". We got utterly dominated the first 10 minutes of the game, both of us dying 2x each and I got about 6 last hits total. He is shit talking me the whole time, turning the other 3 teammates against me. I never lost my cool, I rationally just tried to explain the the situation... LOL like that worked. They all reported me and I was instantly sent to low-pro.
The problem is that their system is setup to punish bad behavior, but their players use it to punish what they perceive as bad play. That is fundamentally fucked up.
I really wish they would implement an incentive system rather than a disciplinary one. Kind of like the Tip system that compendium users get to use. Every game you win, you get to give 3 tips away to teammates and in the games you lose you get to give away 1 tip. If you collect 20 tips, you get to spin the wheel for a prize.
The best way to train a dog is to give it small treats for obeying commands, not beat the fuck out of it.