A simple idea (sorry for my poor english if there is any)
The basis of my idea is pretty simple at the end of the game ask the player how they thought of the game similar to how blizzard does with their game HOTS but take it a step further than just ask them how it was try to find out more of why it was like this, for example if I got trolled by a teemo all game and was like omg this game sucked then provide a way of me being able to show this and then from there try to give the player more information on what they could do to help solve their problem with the game such as guides or videos on how to counter and fight teemo better, but it could also be used to help improve on things that then could help solve problems that aren't really problems at all. The way that i see this is that at the end of the game you get asked how your match went if you rate it negatively then it could ask for what reason that you viewed it this way such as an enemy champion or something an ally did etc... then from there it would be nice if there was a way that could better inform people without forcing them to go out of their way to learn because if you don't provide this then they just won't even try to learn. I also thought that if you rate positively it could also be used more of a way to honor people without actually forcing the person to click the honor button. The main reason I even thought of this is that the current way of things that go poorly rather than trying to learn about it or solve it most of the time players just go gg and don't really even try to solve their problem that they had that game. I think it would be better for the community if there was more information spread around to people that just didn't have the info befor. The main reason that I used teemo for this example is that I have friends that I am trying to help learn league and the moment they see teemo they just get mad and just stop wanting to play.... (side note: The way the text box works helped fix most of my broken spelling and other problems with english.)