Can anyone offer a reason why Enchantress debuffs are less effective than their Warrior/Archer counterparts while having shorter range, higher mana cost and a longer cooldown?

Is it because they stack with the other debuffs? Otherwise, they seem mediocre by comparison.

The old descriptions stated that these debuffs had two components (e.g., Nightmare would debuff both target damage and armor). While this description may have been misleading, it made the debuffs seem worth training.

Right now, these skills seem like they need adjusting.