Critical response
Contemporary reviews were mixed. Although Hepburn and Taylor received some positive notices for their performances, the film was judged as having suffered for being stretched to feature length and having its content toned down from that of the play.
Bosley Crowther of The New York Times outright panned the film, writing that "the main trouble with this picture is that an idea that is good for not much more than a blackout is stretched to exhausting length and, for all its fine cast and big direction, it is badly, pretentiously played ... Elizabeth Taylor is rightly roiled as the niece, but her wallow in agony at the climax is sheer histrionic showing off. . . Joseph L. Mankiewicz's direction is strained and sluggish, as is, indeed, the whole conceit of the drama. It should have been left to the off-Broadway stage."
Variety called it "possibly the most bizarre film ever made by any major American company," adding, "The film has some very effective moments, but on the whole it fails to move the spectator. Perhaps the reason is that what was a long one-act play has been expanded in the screenplay, by Williams and Gore Vidal, to a longish motion picture. Nothing that's been added is an improvement on the original; the added scenes are merely diversionary."
Harrison's Reports wrote "Aside from the fact that the film will draw curiosity-seekers in droves, the film is a mystery—and the mystery is why Sam Spiegel, a brilliant producer, Joseph L. Mankiewicz, an excellent director, and Columbia, a responsible distributor, even bothered with it in the first place." John McCarten of The New Yorker called the film "a preposterous and monotonous potpourri of incest, homosexuality, psychiatry, and, so help me, cannibalism."
Richard L. Coe of The Washington Post delivered a mixed review, calling the film "undeniably powerful" and Hepburn "utterly brilliant," but found that "in even trying to fit this analogy of depravity into something approximating our film standards, the whole point is submerged in mists of allusion which only knowledge of the original play can penetrate ... It can be said that the moral is utterly valid, that those we buy and use utterly destroy us, for Mrs. Venable and her wealth are as destroyed as her son and his selfishness. But by framing the statement in so purposely shocking a story and then by not being truly honest about even that, the film too often becomes purposeless, evasive."
The Monthly Film Bulletin wrote that by extending the stage version to feature film length, "the story now sags sufficiently for one to question its credentials, and to realise that its attempt to illuminate the darker corners of the mind is actually nothing more than a slightly infantile fantasy of guilt and masochism." The review also criticized "the spineless box-office ending, which balances Catherine's recovery against a contrived, conventional retreat into madness on the part of Mrs. Venable."
John L. Scott of the Los Angeles Times was more positive, calling the film "an absorbing, in part, shocking motion picture," in which Hepburn and Taylor "pull out all the histrionic stops, resulting in performances that will undoubtedly bring plenty of votes come Oscar-nominating time."
Several people involved with Suddenly, Last Summer later went on to denounce the film. Despite being credited for the screenplay, Tennessee Williams denied having any part in writing it. He thought Elizabeth Taylor was miscast as Catherine, telling Life in 1961: "It stretched my credulity to believe such a 'hip' doll as our Liz wouldn't know at once in the film that she was 'being used for something evil.'" Williams also told The Village Voice in 1973 that Suddenly, Last Summer went too far afield from his original play and "made [him] throw up."
Gore Vidal criticized the ending, which had been altered by director Joseph Mankiewicz, adding: "We were also not helped by ... those overweight ushers from the Roxy Theatre on Fire Island pretending to be small ravenous boys." Mankiewicz himself blamed the source material, describing the play as "badly constructed ... based on the most elementary Freudian psychology."