I only stick to the golden rules of MMO's, if someone plays bad and ends up dying, i usually get some laughs out of it but that's it for me. Said Rules are as follows:

1: If the Healer dies, it is the Tanks fault.
2: If the Tank dies, it is the Healers fault.
3: If the DD dies, it is their own fault.
4: You Pull, You Tank.
5: Pay only attention to People's HP below 50% as a Healer, not before.
6: I don't res you in Dungeon content if i know we can beat the remaining 40% or lower without your aid.
7: There is no exceptions to Rule 1 to 4.