I agree; the more I think about it, the more I wonder about the points raised by Umbran (and others) recently. Which is to say- could you even make something similar today?
Because the three biggest obstacles would be:
1. The "meta-game." For lack of a better phrasing, ToH depending on player skill, and player knowledge. It was testing the players, which is now viewed more as meta-gaming by some.
2. Rolling. So many more things (skill checks, etc.) are assumed to be within the province of a roll today.
3. Subverting expectations. This is the biggie; at the time, the usual experience was more hobmurder-y. See an orc, kill an orc, loot the corpse, rinse, repeat. By making the whole module nearly monster-less, it really subverted (then-current) expectations. Not sure how that would work today.