Granted, no monsters, and I'm glad they can understand themes, but do they appreciate game machanics? In D&D, humans with character classes can outdamage most monsters anyway. Magic is the main defense characters rely on.
Let me ask some specifics here. If curative spells don't remove damage, and characters can't count on magical bonuses to AC, is the damage output of a power-attacking barbarian with a greatsword significantly lessened? Does a rogue still receive 1d6 sneak every other level? Do we have action points, fate points, anything like that?