In the fifth installment, the situation was much better because:
1) Mentorship only granted 50% experience.
2) To acquire it, you needed to take a bunch of other skills and abilities, which were also given randomly.
P.S.: It's only 25%, not 50%.
2) A hero of any Faction needs to take only 6 skills to gain mentorship: max out Education, take two skills from it, and then take mentorship itself.
But, if in Heroes 6 it really gives 75% even at the first level of the skill... Then there really will be an imbalance. Considering that "Heroic Strike" now really helps. And it grows with physical characteristics, which means it also grows with level.
Цикл "Закадычные враги": "Особенное гостеприимство, "Супероружие", "Меж молотом и наковальней"
"Падение Шантири"
Кампания для "Кодекса Войны"
"Выбор Сагиттеля"