Al Nofi in
Amra, observing that the book "has neither characters nor plot line in common with the earlier pair" of Novarian novels, finds this "a very good move on Mr. de Camp's part; it saves the work needed to construct a credible ethos yet gives the author an opportunity to work with new characters and situations." Noting that "Mr. de Camp, of course, has been doing unusual things with his swords and sorcery for years," he calls the demon Zdim Akh's son "a most unusual hero indeed," "one of de Camp's best heroes yet; to me, he seems more human, even, than the hordes of breech-clothed, shaggy-haired giants with names all ending in
-ar who romp through countless S & S sagas. All in all, this is a fine book." Roger C. Schlobin praises the book's "[d]elightful episodes occur[ring] as the fiend misunderstands his commands and tries to function in a totally alien environment, which is, of course, quite normal for the reader." He feels it "[d]eteriorates somewhat at the end as the fiend becomes a hero and saves civilization.
Brian M. Stableford calls "
The Fallible Fiend ... more offbeat than de Camp's other ventures in the genre," and Zdim "perhaps the only sword-and-sorcery hero who regularly devours people. Still, he remains likable as he provides a suitably ironic commentary on human affairs from the demonic standpoint."
Steven Silver called the book "a humorous novel, although not in a laugh-out-loud way." He sees its "main point [as] satire, a fact which is driven home if the reader begins to look at characterization or plot, neither of which appear in particular abundance. ... The characters are drawn with broad strokes, each inspired by one, or possibly two, character traits." But "as [with] most satire, he causes the reader[s] to recognize the humor of the situation and compare it to their own situation." Silver sees "Zdim's travels throughout Novaria as a pretext for unleashing slings and arrows of outrageous satire at governmental practices and systems ... thereby highlighting the follies of our own system of government." The hero's contact with other cultures, the "fantasy staples" of "the semi-human Zaperazh, the horse nomadic Hruntings, and the cannibalistic Paaluans ... clearly shows why each is as implausible as the more 'corrupt' human institutions of civilizations."
Don D'Ammassa finds "
The Fallible Fiend ... in much the same vein" as
The Reluctant King series, with "[m]ost of the humor com[ing] from the efforts by the demon to understand human behavior."
Mike Ashley called the story "a wonderfully nostalgic fantasy in the
Unknown tradition." ==Awards==