1. Don't let tank die!
2. Tank has healing priority.
3. If tank is fine heal DPS.
4. Always try to dps, even if it's just DoTs, I've noticed even when things are hectic there is always a small opening to apply these.
5. Don't talk or at minimum, just say "o/" or "ty". Otherwise things will turn into drama.
6. Rule 5 doesn't apply if I have to afk for whatever reason. Must let party know.
7. Don't get involved in play disputes between players.
8. Do report parser users if they reveal numbers and use it to harass people.
9. Don't play DPS or Tank. It is just asking for a kick.
10. Don't play Savage or Ultimate. I am not good enough for this content so don't bother.
11. Do not join any guilds/FCs for whatever reason. Drama will just ensue.

I can't think of anything else but those are my unwritten rules. Keeps my play experience pleasant. :3