I never really thought about it before, but today really opened my eyes. I entered a CT run, and one of the parties was apparently mostly pre-made, and they decided to troll everyone by playing poorly, pulling monsters before everyone was there/ready, and generally spent their time trying to make it impossible to clear anything.
Then people refuse to vote abandon, for who knows what reason. There's really no recourse if most of a party is busy trolling everyone. You can only kick someone in your own party, so if over 50% of a party is in on the troll, everyone's just kind of screwed.
I don't know what the solution is, but hey, something to think about, right!?