If I earned $1 for every time I hear people complain about typical MMOG quests (kill this, collect that, defend here) I would probably be a very rich man. Why though, do we complain about such quests when the majority of them are pretty good?
Massively multiplayer games have notoriously harsh environments to play in. It isn't from the monsters, but the players who inhabit these worlds. Should we and developers do more to stop this behavior?