I'd rather have an icon somewhere indicating how's your dps for the current encounter compared to the dps expected with your job on that boss by SE. could be red if you're above what is expected of you, green if you're on the average and blue if you're not pulling your weight.

The only way to harass someone would be asking for a screen of various moment of the encounter, it would be too tedious. It would also have the advantage of giving you a clear idea of when in a fight you're not performing as you're supposed to.