Did anyone actually run ToH as part of their campaign?
Much like Jester, I ran RttToH as part of the final push of a 13 year campaign, converting it to 3.x, upping the lethality of some things to match the level of my PCs, and using the original as the prime resource for the Tomb itself if there were any conflicting design choices. Being a generally no holds barred DM, and having racked up over 30 PC deaths over 13 years, the Players understood that I was presenting a challenge, but a fair one.
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The PCs navigated it with no deaths, though several close calls, like when the flying rogue was investigating the teeter/tapestry room, and someone outside of the room decided to fire a crossbow bolt into the tapestry he was approaching in order to scare out anything hiding behind it.
This of course caused the tapestry to turn to green slime and engulf the thief, and thus blinded, he flew screaming around the room triggering the other tapestries until, hearing the shouts of the party through his dissolving ears, he flew madly out into the hall, while fireballs were arced into the room triggering the brown mold tapestries to explode in growth, causing the rest of the PCs to scramble away from the doorway madly, while the thief screamed across the mindlink to fireball him for love of all that was holy.
Good times.

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All in all, there were a few players who were trepidatious about the module's reputation, but because they were long standing characters played by wily people who knew it was important to bring their A-game, they did, and smote Acererak's ruin.
As such, I've never found ToH to be appropriately targeted as a "worst" module, in any class. Unenjoyable or Inappropriate for some groups, absolutley.
If I was going to call out bad old modules, I'd go with the following:
Castle Caldwell (which I gutted and reworked successfully years later into a fun romp which generated some of the best game stories ever)
The Dymrak Dread
Terrible Trouble at Tragidore (Sorry Mr. Mona)
Quest for the Heartstone
Throne of Bloodstone
Needle (Oh, do not get me started about the stupid Mercantile Moon Spiders who domesticate Brass Dragons!)
Quagmire
and Palace of the Silver Princess (some interesting ideas hidden in it, but damned if it wasn't just a mess overall)