I think this game has just right difficulty level. You can make it so much easier if you start abusing potion of hill giants, speed potions and invisibility potions. Also stealth is broken. You can just kill everything with one character and stealth. Just go behind wall or rock and shoot arrows, go hide, shoot arrows etc. Enemies just eat those arrows and be like "What's that? Arrow to the head? Just another day, nothing to be worried about.".
