I had a thought about a limited implementation of a "parser".
It could take the form of a "Battle Report", and be displayed at the end of an instance along with the commendation and loot windows.

It would display only:
DPS rankings, no figures, just 1st, 2nd, 3rd etc.
Your personal DPS, damage taken, healing received, etc for the entire instance.
Your highest damage single hit.
Recap all the loot you received.
Then give a star ranking for your party's overall performance similar FFXIII.

As this would be pretty much just your personal figures, and nothing shared besides a general dps rank, there wouldn't be much to use to harass other players, plus being solely at the end of an instance means it cant lead to kicking, once you discover any results you've already completed you obligations to that party.
However it would serve the intended purpose of a parser to help individuals know where they might be going wrong and encourage them to improve.
Plus there would then be a tangible reference to base commendations on if you wanted to, and something to screenshot for high end bragging rights.