An alternative to parsers...

[Sigiria]

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.

[Zojha]

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.

That could easily lead to false perceptions, as on the first days of release, every DPS would end up in the blue area, while any tank or healer doing as much as flinging an off spell or deviating from only aggro combo via OGCDs or changing the combo would end up in the red.

That's because SE's expectations are completely skewed - Any DPS from healers is exceptional, tanks doing anything but spamming the aggro combo is exceptional and DPS are measured by the standard of 85-90% of their dummy performance with an item level noticeably above the minimum to enter. That shouldn't be a standard for anything ever.