I commend whoever I feel did their job the best.

If the enemies died a lot faster than normal and I see appropriate buffs or clever usage of DPS skills, such as Shukuchi by a Ninja, I commend the DPS for using their kit well. Sometimes I commend them for using the ranged DPS limit break on mobs or the DPS limit break earlier in the fight because it's actually common for it to go unused otherwise.

Believe it or not you can get DPS that don't do AoE when you have pulled 50 enemies, so just playing your role right and doing AoE can get you a commendation.

If it's the person's first time in the dungeon I commend them for much simpler reasons, such as not dying or doing a mechanic right even though it's their first time.

Quote Originally Posted by SamRF View Post
You think it would be feasible to add some more dps checks in dungeons?
Dungeons are story content and story content is not intended to be challenging. The story versions are there for people who just want to enjoy the story and the social environment. Doing a dungeon with 3 others can help you feel better after a bad day, despite that it's not significantly challenging.

Those who want to be challenged can do extreme, savage and ultimate content or attempt dungeons in interesting ways, such as minimum item level with no tank or healer.

Quote Originally Posted by SamRF View Post
don't like the fact that tank + healer can do almost every dungeon without dps.
Since it's usually someone's first time in a dungeon and a lot of the others are casual players, it being challenging with DPS checks would mean doing their jobs mattered. If doing their jobs matters then people will ask them to use the best gear, food and damage potions and be really toxic if they don't. The fact a single competent player can hold the dungeon run together makes FFXIV a far less toxic game to do dungeons in.