Most of the players in this game aren't qualified to offer a meaningful assessment of anyone's performance.

You'll find that the better you play healer in DF content, the less comms you tend to get, because to the average casual player optimized healing tends to be frightening. The same goes for good DPS players, who will often purposely stand in AOEs during mob pulls to avoid disengaging, as its basically impossible to take cumulatively fatal damage during the vast majority of add pulls (barring the tank dying or failing to hold aggro).