Why are low standards for dps acceptable?
• Because I'm running dungeons, not raids. Nothing high-stakes, unless these bosses have enrage timers that I'm not aware of.

• Because I'm not exactly the greatest DPSer either. It'd be hypocritical of me to hold people to expectations I couldn't meet myself.

• As a corollary to the previous entry I'm pretty new to this game, so if the other guy wants to be a leech that's fine. It just means I get more practice.