DPS display could easily be solved with a system already in game.

[Eidolon]

Check the hate list, if you're high on it you're doing good enough DPS. I learned this after 2 days DPS'ing. I'm a White Mage and I figured this out, I don't need parsers.

As iLv.111 DRG I'm often 2 or 3 on the hate list in WoD. Just seeing that is enough to see my rotations are fair and playing a part towards victory. I don't need Obama in my ear.

Quellign Strikes. Elusive Jump. Being a monk (Good sustained but no threat dumps.) These instantly mitigate your point. What's more likely happening is you're just dealing less DPS than everyone else - you're just not popping any threat dropping abilities (sorry!)

Please, NEVER think that "Threat" is a measure of DPS. It isn't. Threat is literally just that - it's how much enmity you generate. What a good DPS does: Deals DPS, while making sure their threat threshhold never exceeds the tank (That second part is important to me whenever I play my i130 DRG.)