It really does amuse me how much people will insist that poor play is optimal play due to misunderstandings, the knock on solid play-styles due to it not meshing with their personal concept of a class. You see so much knocking on Holy-Renew, or Druid-HT, but they don't seem to care about actual bad play. I've had to reject many apps from healers because they're too one-dimensional. Shaman who over-use Chain Heal and Disc Priests that over-use PW:S are by far the biggest offenders though.
There's a small percentage of healers that have some kind of religious zeal for their misconceptions about their own class. It's scary. My absolute favorite though was having to look over the parse of a Priest who was raid shielding on Jaraxxus, which he actually pointed out to me to flex his ability as a healer. He managed something spectacular like 8k HPS on Jaraxxus by raid shielding because logs don't give accurate readouts. After telling him that he was most likely closer to 2k HPS due to the fight mechanics he brought up that he used to get really nice numbers on Twins, but that logs were broken now so he couldn't show me. I couldn't stop laughing. :P