There's some truth in that, but i still hope that by term 'powerful' means at the end of the game:
- Regular monsters, thiefs --> easy
- Tougher henchmen --> medium, if you know what you're doing and have a balanced party, they're easy. Otherwise, they can severly hurt you.
- Bosses --> you have the power to destroy mountains and cause tsunamis with a snap of your finger, but it's useless against the them since their HP is high, they have great willpower and are immunce to several different spells. Tactics and patience is a must.