Frightening Attack is the single most reliable CC setup in the game, and 2H fighter is the most powerful class by far, especially if supported by a Bless bot cleric supplementing damage with Inflict Wounds.
Yeah, about that. Larian overpowered Menacing Attack, too. Or rather the Frightened condition that it inflicts.
The Frightened condition does not make enemies flee and trigger AoO's. It gives disadvantage to attacks and stops you from moving closer to the source of fear. So a Frightened Bulette or Minotaur would still keep fighting, just with a disadvantage for one turn. And they would not give you free attacks on them.
So, another house rule that breaks balance. Not much incentive to pick Eldritch Knight when Menacing Strike from Battlemaster just single handedly destroys all the toughest enemies. Boss fights are generally why you have a Wizard in the party who can CC and peak perform, but funnily enough they don't have anything as powerful as Menacing Strike in its current form. Best they can do is DPS with the OP magic missile amulet, which is also rather backwards for their intended low level role.
Maybe Larian just hates 5e and would rather make a DOS 3.