Riot's Matchmaking System Sucks

I vehemently disagree with the way Riot has their matchmaking system set up. I am currently gold 4, highest rank gold 2, but I was demoted two ranks in one day for the reasons I'm about to go into. I think that for a gold player, I'm above average. Most solo queue players come into league by themselves and don't have anyone who knows the game to teach them. I have a high diamond friend who is a jungle main just like me who frequently played normals with me and taught me how to be a better player. As a result, I quickly climbed to gold 2, but then everything changed. I suppose Riot matchmaking figured my mmr was getting too high so I started getting paired up with some of the worst players I've ever seen in gold. I felt like I was in an episode of wood division adventures every game for like 15 games in a row. I've had some bad loss streaks in the past but this was something else. I don't care if you're faker, if your entire team feeds every game for 15 games. you're going to have one hell of a time carrying. As a result, my rank went from gold 2 to gold 4 in a matter of hours and my mmr tanked from plat 5 to silver 1. That's just complete bs. Riot has this thing set up all wrong. If your mmr is high like mine was, you shouldn't get paired up with shitters to prove you can carry them game after game. What should happen is you should get paired with and against people with the same mmr as you regardless of their rank so that you can prove you can play at their level. I want to know who thought it would be a good idea to reward good play with bad teammates, because that person needs to be fired, like ASAP. This occurrence pretty much completely turned me off to the game, I'm just sick of all the stupid shit Riot pulls. I may or may not continue playing league after this, but I want Riot to know that they are certainly losing players because of shit like this and they need to change it.