What is your preference for a player to get a commendation?

[Gemina]

Whether I am running as healer or DPS, I try to give everyone an equal opportunity to earn a commendation. However as healer, it easier for me to evaluate everyone's performances since the amount I heal is a direct result of that. If I could design a points system and implement it to keep track of player performances, it would work something like this:

Awarded
-----------
Says hello/goodbye before and after instance: +1
At any point, takes time to explain mechanics: +1
Performs their duty adequately: +1
Does not take unnecessary damage: +1
Goes above and beyond the bare minimum: +2
Polite and courteous to other players: +2
Saves an instance that would have otherwise failed: +3

Deductions
-------------
Does not greet, or say farewell/thanks after clear: -1
Ignores mechanics or does not care to learn them: -1
Cannot perform the bare minimum: -1
Shows up unprepared: -1
Deliberately makes things harder for others, and inefficient: -2
Rude, belligerent behaviour towards others: -2
Causes wipe and does not care: -3 (-1 otherwise)

That's about the best I can come up with. If there is a tie, then no one gets a commendation. Have to be fair, yeah?