Players hate Priest because Priest can heal to almost full health and has insane late game value. The idea behind Priest should be “stay alive long enough to execute my game plan.”
And once they do, the longer you’re in the match, the more cards they’re going to play. And some Priest matches can get long and intense. You might lose to 20 Hunters by T6 and not bat an eye.
But that one priest stands out in your mind because it’s memorable due to the length of the match.
The idea that aggro doesn’t take skill is a very narrow minded school of thought. Just because you like to draw out matches as long as possible (and probably missing lethal more often than not) doesn’t give you the right to assume anyone playing an aggro deck is an idiot.
Your morality and IQ does not change with the deck you play. Hunter and Priest are my favorite classes but Priest doesn’t have anything good and relies way too much on random card generation.
This is what made Cleric so great - she could help you with card draw without the RNG of random card generation. Yes, Priest has some powerful spells but they also have a lot of situational spells.