Man in the Funny Hat
Hero
It is bad design for standard campaign play because its design is intended not to merely challenge but to KILL PC's. It puts the DM and the players in a directly adversarial relationship. However, the DM ALWAYS wins if the DM WANTS to win. The only way the DM can ever lose is by sheer incompetence. If the DM wants the PC's dead - they die. It's as easy as breathing to throw them up against something that they CANNOT defeat.
This is not to say that adventures that are deadly have no place. They do. But the point about letting PC's get in WAY over their heads is making it THEIR choice to tempt fate, not to make it the *DM'S* choice to seal it. Even there TOH is a less than ideal design because as mentioned it is still INTENDED to kill PC's for the sole sake of killing PC's. Any fool can do that by violating rules conventions, providing no-save traps without even providing a clue that a trap exists, creating new monsters specifically engineered to be unkillable and so forth. A good design would not need to resort to "No warning - you're dead - no save" to be a killer adventure.
This is not to say that adventures that are deadly have no place. They do. But the point about letting PC's get in WAY over their heads is making it THEIR choice to tempt fate, not to make it the *DM'S* choice to seal it. Even there TOH is a less than ideal design because as mentioned it is still INTENDED to kill PC's for the sole sake of killing PC's. Any fool can do that by violating rules conventions, providing no-save traps without even providing a clue that a trap exists, creating new monsters specifically engineered to be unkillable and so forth. A good design would not need to resort to "No warning - you're dead - no save" to be a killer adventure.