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A lot of people in League of Legends have specific roles they like to play. Some people only play mid, others prefer top or jungle.
I've gotten into rooms where no one wants to go bot, or top, or jungle. Someone ends up either dodging or feeding the entire game.
Solution: Have a "Find me a team" button. It places you in a room with 4 other players. You talk, you discuss strat, then when everyone is ready, you go play. This would encourage more teamwork and would help negate some of the poison players out there.