Doug McCrae
Legend
I don't think any edition of D&D does horror well. The system requires lots and lots of fights to balance fighters against wizards, and you simply can't have that in horrror.Ravenloft is probably better outside of 3.5/4e.
Even Clark Ashton Smith-style 'greedy treasure hunters getting their comeuppance' requires far fewer monsters than traditional D&D, and a slower pace. Lurking menace, not 5 goblins in a room.
Does D&D do anything well apart from D&D? I'm not sure that it does.