All badly played jobs perform badly, all well played jobs perform well. I'd concede that a poorly played MCH is more heavily impacted than some jobs, but MCH itself really isn't as difficult as it's cracked up to be. It's practise, understanding of the job mechanics, familiarity with encounters and muscle memory. In terms of how it performs 'well' comparatively with others, the question becomes more complicated, bringing in a) who are you playing alongside and b) what content are you talking about. If we're talking 'casual content' like 4 mans, Alex normal or Void Ark; its incredibly rare I'm out damaged by anyone in any of them - unless you fluke a stellar BLM, DRG, MNK in a roulette. If we're talking savage, I'm never really that far behind (or behind at all) any of the other DPS on anything unless I've been screwed by rng (hello AS4 toilet, excessive polarities etc) or have had to provide more support turret than normal because of a 'whoops'.