You don't need a parser to tell that someone isn't good. Regardless of whether you're a tank, healer or DPS, it is easy to tell if you're bad at your job. Healers who only heal aren't really bad, but to bring parsers into the mix? I mean... you don't need to have a degree in rocket science to know that a Bard is bad when they don't sing Foe for a DPSing healer and a BLM/SMN.