Hearthpwn

Not even gonna try to argue someone who said this:

"On the grim patron part, first off, grim patron warrior hard to play? On what planet? :D The gameplan of that deck was literally 'mull for patron and any of inner rage, whirlwind or frostbite and roll your opponent at turn 6 or refill with battle rage if the opponent managed to clear any', it was arguably easier to play than face hunter."

So much for your understanding of the game.

In Mercenaries it can be done quick, since every turn you can deal 10+ spell damage.

Quest Warrior isn't even the strongest deck in Standard right now. And general win rate statistics aren't something that can be used to prove the strenght of a deck. For example, Grim Patron Warrior was, arguably, the strongest deck in HS history and yet it had winrate under 50%, because it was also one of the hardest decks to pilot properly. And that's why many players feel like Quest Warrior is OP, because it's one of the least punishing decks if not played properly and one of the most punishing decks if not played properly against.