They are hard and requires either cheesing or min max'ing every advantage because they are overtuned and are Larian'd up, with advantages and attacks they don't actually have. That goes for most enemies in the game, they all are overtuned but the players aren't.
Taken directly from 5e:
Charge: If the minotaur moves at least 10 ft. straight toward a target and then hits it with a gore Attack on the same turn, the target takes an extra 9 (2d8) piercing damage. If the target is a creature, it must succeed on a DC 14 Strength saving throw or be pushed up to 10 ft. away and knocked prone.
Labyrinthine Recall: The minotaur can perfectly recall any path it has traveled.
Reckless: At the start of its turn, the minotaur can gain advantage on all melee weapon Attack rolls it makes during that turn, but Attack rolls against it have advantage until the start of its next turn.
Actions Greataxe: Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 17 (2d12 + 4) slashing damage.
Gore: Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) piercing damage.
Nowhere is there 3 actions per turn and an AoE prone jump with a knockback in the same turn. They are way overtuned...for some stupid reason. Like why? Bc Larian. You can make things difficult and fun in different ways then just giving random shit to enemies and requiring players to reload and min-max for every advantage. That in turn makes the combat feels the same way. Every combat will be the same, and/or every type of combat with that type of enemy will be the same. Which again, isn't fun for a lot of people.
I did beat them originally after 3 tries and a second play through using the Zhent entrance. They are a little ridiculous and my initial reaction was "WTF with this jumping 5 miles across my screen!" Even on my second play through one managed to jump up onto the ledge. I immediately looked them up to refresh my memory on their abilities and shook my head. All that said there are many ways to beat them, Ogre help, elevation bow and arrow and spell DPS, lucky rolls etc. And if you are really lucky, lure their fat asses back to the fort and turn on the lazer beams.