AFK/Leaver
After 4 seasons and a preseason of season 5, RIOT still makes us suffer with them (leaver/afk) so we can ruin our LP and MMR. Don't give me excuse that it's possible to win 4vs5. I won my promo and stuff because the other team had a leaver.
I don't need to tell you how to fix it, you have years of experiences in this game that's relatively "old".
inb4downvotebecauselolforumisjustlikereddit