I commend DPS when

- the player doesn't die, this means the player isn't blind or a total doofus and means the player knows the games content that is played at the moment
- when the DPS isn't undergeared and uses Materia well
- when the player knows what top priority targets are and doesn't need to be told like a little child when what has to be attacked in which order to help out tank/healer and as result make instanced content much smoother.
- when DPS uses support skills INTELLIGENTLY at correct moments and doesn't spam them out, just because it's usable right now, skills like Brotherhood, Troubador ect.
- when DPS makes good player responsive targeting switches and is able to adapt their target switchings based on which Job the other DPS is/are and uses Burst Damage Skills not on Targets, that are likely to be killed by a ranged simple skilll rotation of the standard attack skills
- when they can in case of Redmages save the day and are required to make the content due to incompetent healer in the group and they actively help healing n rezzing, without needing to remind the player first that his job can do more, than dealing only damage...
- if I absolutely like the name and visuals of the character
- if the player teaches things n helps others to get better in doing in general their DPS part in the game's content.