All my favorites are 1e. There were 2e Dungeon adventures that i liked a lot, but no published modules blew me away. I agree Paladin In Hell was pretty good. I disliked Dead Gods. Temple of Elemental Evil, in any incarnation, was just too frickin long! Doing it piecemeal was good, though.
There are 3e modules I am willing to call "classic". Such as Grey Citadel, the "Coin" Series, Lost City of Barakus, Hall of the Rainbow Mage, Banewarrens, Morrick Mansion, and a few others. Mostly from Necromancer Games, which is why I am one of their "fanboy's". Consistent and good, with a fair amount of originality.