According to
John Kenneth Muir, who interpreted the plot as a "cautionary tale about excess", the episode is often thought of as the worst of
UFO due to its "underwhelming" final
plot twist. He questioned why the SHADO scenes are played straight despite being part of Foster's nightmare, arguing that because of this, the story "doesn't quite hold together". However, he considered the overall episode to be "well filmed" and "visually dynamic", as well as a "nice showcase for Michael Billington".
Infinity magazine placed "Ordeal" among several "duff" episodes of
UFO, describing the story as "just an elongated
dream sequence". Review website Entertainment Focus called it "daft and poorly written", also commenting that the nightmare itself "makes bewilderingly little sense" as it includes scenes in which Foster, the one having the nightmare, does not appear.
Justin Richards argued that despite the episode's negative reputation, the twist ending "does not detract from the 'dream' story", which he found to be well integrated with the real-world plot through "almost subliminal images". Believing it to be one of the series' "more dated" episodes,
Video Watchdog magazine describes "Ordeal" as a "dull and thoroughly predictable outing; we are never even given a good look inside the aliens' craft, let alone a clearer idea of their motives, and the medical procedure is disappointingly simplistic." Review website The Anorak Zone ranks "Ordeal" the second-worst episode of the series, calling it "more just inessential than anything else" and "a time filler". ==References==