Morgot's servants more terrifying than Sauron's?

[Inziladun]

Originally Posted by Kuruharan

I would say absolutely without a shadow of a doubt.

I see what you did there.

I would put a caveat on that by saying that maybe the Nazgûl were especially terrifying to Men.

It was established that Legolas, and Elves in general, didn't display much fear of the Ringwraiths. Glorfindel charged the Witch-king himself and ran him out of the North. Dwarves? Who knows, although they were immune from becoming Wraiths.

The Nazgûl were 'living ghosts', and their horrible, unique status in Middle-earth was reflected in the hopeless wails they sounded, as well as the feel of dread that surrounded them. That fear and hopelessness, as 'stretched' extensions of Sauron's will that were prevented from release as long as Sauron endured, could have called to other Men's fea and caused them a terror beyond that endured by other races.