Play the new Ladder Rooms, chances to be prized with leavers are infinity smaller. As for bad manners and noobs... they are hardcoded in every game that exist, so get used. I play on Garena since it was an open beta, but I kind of become very absent, mostly due to other games, must admit PotM contributed greatly in this, returning now, regaining "shape", like riding a bike, but even though after several months idle, noobed a few times, finally getting well again.