Honestly, I have more of an issue with tanks who think that they don't need their tank stance because they saw someone else do it that way once and all they are concerned about is their DPS. I'd rather a tank play defensively until they're sure of both their and the parties skill before experimenting. A tank pulling 700 dps is not the end of the world. Sure, there are players that can put out higher numbers, but if you don't want to roll the dice in DF, then go in with a premade.

Now a DPS pulling sub-500 dps in full 250+ gear, that's a complaint I can get behind.