Beyond Tilted

I main JNG and 2nd Mid. Stuck in Bronze 4 Elo Hell. Last game was Vi went 13/8/1 147 CS 29 min game. I cant even JNG in this Elo because players are so bad and troll pick characters they have no experience on. For instance, that same match had a Kayle Mid that went Comet into a Yasuo. Went 1/12/6 with 97 CS. Then my ADC twitch went 2/6/11 with 69 CS. The MMR system is based off win percentage and not a whole lot of other factors which makes it impossible to climb out of Elo hell when you get troll players. The Kayle's legit reason behind being so bad that they said in chat was they were doing it for the learning experience. !! In ranked !! There needs to be a system in place where you cant pick a character until you've reached a so many XP points on that character. This is why some players get so tilted in games because they want to win they play competitive and have a winning mindset and no matter what you do, you lose. The game before that was WW went 19/4/2, still lost. No matter what advantages I give a lane they squander it. You know it's bad when the opposing team is also flaming your teammates for being so bad....either way rant over.