Why I Uninstalled
I play casually on this account and one other...maybe 1 game per day or every other day. I'm tired of people playing champs for the first time during ranked matches and ruining them, something should be done about this. I know I would have been in silver forever playing only a few games per week, but if I want to make slow progress in a game, I would expect games wouldn't be ruined by people trying champs for the first time in ranked (especially since you have to dedicate 50 minutes for one match).
My solution? Before you can que for ranked, you MUST have 2 or 3 champs at mastery IV or V rating for each role you selected. That means if you want to que for top and mid, you must have 3 top champs at mastery V and 3 mid champs at mastery V. You may ONLY play those champs that have reached mastery V (or IV if you want it easier).
This will force players to learn their champs in normal games before using them in a serious ranked match. I think this would make league much more pleasant for bronze and silver players (probably higher ranks to). Until some sort of system like this is put in place to make ranked matches more serious, I can't justify investing time into this game.