A lot of MMO's these days use a vote kick type system. I've run well over 100+ dungeons under these systems and not once have I seen it abused. Does it happen? I'm sure it does and I've heard stories, but generally, for the most part, people are good and understanding. Those that don't want to deal with gear rolls, lower than they want dps, cutscene watchers, new players generally just form up their own groups and avoid the auto group finders.
