I find it REALLY at ends with the design teams supposed intentions that MCH can quite easily and accidentally Overheat, killing their DPS for at least the 10 seconds they are cooling their barrel, (long than that by far if they can't use Stabilizer or Flamethrower) or for at least 30 seconds if they make the poor decision to use Overdrive.

It's really at ends because Square said they wanted to CLOSE the gap between the skill floor and ceiling for classes, (IE. the best players shouldn't be so much better than the 'entry level' players at simply playing their class.) And then they add an actual DPS penalty that lasts several GCDs just for hitting the wrong button.