That’s very much because Priest is NOT allowed to have a good control deck in the meta. Warlock is allowed, Warrior is allowed…heck, even Shaman is allowed. But Priest must be kept out of the meta with a control deck and be kept at Tier 4 or low Tier 3 status.
Any reason people give for hating Priest can almost always be applied to Warlock. I think the difference in play is that Priest plays more counter style and Warlock is more aggressive.
It’s all psychological as far as I can tell.
Take these 2 scenarios that play out different, but result in the same exact end result.
Warlock plays some minions on board and threatens the board on turns 3-8.
Enemy loses minions and spells in the process.
Then, the enemy dumps their minions on board.
Warlock plays Twisting Nether, enemy loses their entire board.
Opponent just shrugs and tries again.
Warlock then OTKs them.
Opponent just shrugs and moves on to the next opponent.
Priest doesn’t play minions on board early, and instead uses a spell or two to take out individual threatening minions or heals.
Priest doesn’t really threaten a board until turns 6-8, to which the enemy removes easily.
Enemy loses minions and spells in the process.
Enemy then dumps their minions on board.
Priest removes the entire board with X spell (plague of death, etc).
Opponent loses their mind.
Priest then resurrects their minions (not OTK), and tries to kill the opponent a few turns later with said resurrected minions.
Opponent loses their mind, complains on the forums how this is unfair to resurrect minions that have already been killed.
So, what’s the difference?
Priest gives you slivers of hope that you are going to win, then slowly destroys that hope.
Warlock gives you sliver of hope that you are going to win, and instantaneous destroys that hope with a 1 turn win.
For whatever reason, players hate having their hopes of winning destroyed slowly and instead want their hope crushed in finality.
In the long run, it’s all psychological, but ultimately, Warlock is doing the same thing, often better and more efficient.