The Monthly Film Bulletin wrote: "This static and stagey melodrama is unimaginatively handled, finishing with a trick ending which explains remarkably little. Alexander Knox, as the psychiatrist, brings some degree of plausibility to the proceedings, but the playing generally is characterless."[5]
Chibnall and McFarlane in The British 'B' Film wrote: "It was a pretty botched job, over-played and under-plotted."[1]
In British Sound Films: The Studio Years 1928โ1959David Quinlan rated the film as "poor", writing: "Dreary, turgid drama: seems much longer than it is."[7]
TV Guide called the film "a poorly developed psychological drama",[8] while Allmovie described it as "an average psychological mystery worth watching for the good performances."[9]
In Offbeat: British Cinema's Curiosities, Obscurities and Forgotten Items, Jennifer Wallis wrote: "The Danzingers' high speed production accounts for the short running time. ...In the context of such whistle-stop production, Alias John Preston is an impressive feat, and in no way a bad film per se. Its tightly compacted plot and self-conscious intensity, though, tire the viewer before becoming somewhat infuriating in their transparency."[10]
^Wallis, Jennifer (2022). "Alias John Preston". In Upton, Julian (ed.). Offbeat: British Cinema's Curiosities, Obscurities and Forgotten Items (2nd ed.). Headpress. pp. 21โ22. ISBN9781909394933.