Gauging job performance - how to measure them all?

[MirielleLavandre]

I know people can use parsers and check their dps if they are a dps job, and can therefore see how well they are doing vs. others (and it is kind of sad that not everyone can do this and that is is against the ToS). But how do we measure how well tanks and healers are doing? I know on my PLD I would deem I'm doing well if I hold aggro and put up a bit of dps.

My question is, on my WHM which I've made my new main (from NIN), how do I gauge my performance? I can't really go by healing done, since that may only reflect I had some underperforming dps that couldn't dodge and stood in AoE, thus I had to heal more. I can't use my dps done as a WHM since that may just mean either I was secondary heal and/or had a great group so could dps more. Is the only thing healers have to gauge performance is keeping people alive? I would love a real world way to tell how well I'm doing, much as I can by finding out my dps numbers vs. others -- and therefore work on doing better. Any suggestions or ideas on how to gauge healer job performance?

I guess in general, aside from parses, I'm wondering how people gauge the performance of healers and tanks and even dps. ^_^v Or what methods people use to define if a healer, tank, dps is 'good'.