Why is hack and slash concidered "very easy"? Maybe hack and slash means weaker enemies, but a larger quantity, balancing the game difficulty out. And maybe hardcore is simply VERY few enemies, but only strong enemies.
Larian hasn't really commented on these game-modes yet, but I think that they are all basically the same difficulty, since you can regulate the difficulty at the beginning too. Different doesn't mean easier or harder. It COULD, but it doesn't necesarily have to.
Tovi 
