That's right. What kind of hero is this if he can kill any high-level monster with a single blow? This is already turning into an RPG, or even an action game. But Heroes is primarily a strategy game. In the fourth installment, they needed to balance the shift towards RPG elements and away from strategy. They should have strengthened the units and weakened the hero, or implemented experience growth for the units. And it should be impossible to resurrect a hero for free (making this possible only in certain, hard-to-reach locations).