What will the minotaurs do to him? They won't be able to do anything, and the medusas won't do much with their shot either, but they will be followed by petrification)))

Therefore, for online play, medusas are more useful than minotaurs, and for offline play, minotaurs are more useful than medusas. When discussing the usefulness of monsters, at least consider it from the perspective of which type of tournament they will be used in.
In offline play, although rare, this pair of minotaur and medusa can sometimes interact very well. For example, one minotaur can protect a dozen medusas in a dispersed formation so that no one can reach them in melee combat. Then, by loading a save, the minotaur blocks the medusas, and they shoot everyone down, provided there are no magical units or archers in the enemy army.