What are "rules" of MMOs that you have discovered?

[Skotie]

1) When someone queues into extreme content and say they are new, you are required to give explain to them the entire fight or else you're the bad guy.

1.) Or you could just drop group which is more often the case.

Even though your playing an online game made mostly as a online Co-Op experience people will hate grouping together and demand to do things solo.