I'm a MCH main, but I heal dungeons a decent bit simply because it takes no real effort, (barring horrible groups). When I was leveling my SCH, I ran into a MCH in the Aery that made me understand why we MCHs tend to have a bad reputation. This was the MCH equivalent of a Ruin Only SMN or an Ice Mage. They use their turret only twice the entire run, at the first boss when I mentioned to remember it, and at the very end of the final boss fight right before it died. While I wasn't always watching their rotation, so I don't know for certain if they used other skills, I also know for a fact that they didn't use their DoT, (AKA MCH's most powerful single skill aside from a full rotation Wildfire), even once the entire run. Just because these types of players are rare, doesn't mean they don't exist. It just means you were lucky enough to not get paired with them....