“It is an over-decorated, over-fluffed, over-sentimentalized endeavor to pretend the lace-curtain millionaires are—or were—every bit as folksy as the old prize-fighters and the Irish brawlers in the saloon. […] Miss Garson gives a performance that is pure Mrs. Miniver alongside Mr. MacMurray’s splay-footed aristocrat. The juxtaposition is crushing. But it was forecast.”Bosley Crowther: Music Hall Is Offering ‘Happiest Millionaire’. In: The New York Times, 1. Dezember 1967.
variety.com
“MacMurray, snug in an excellent characterization, is well teamed with Greer Garson […]. Lesley Ann Warren plays the teenage daughter with charm and radiance.” Vgl. The Happiest Millionaire. In: Variety, 1967.
web.archive.org
“Unfortunately, Millionaire onscreen lacks the charm […] of its predecessor [Mary Poppins]. Norman Tokar’s direction is workmanlike but uninspired […]. The score is fine, but it’s not good enough to cover the flaws in the screenplay and direction. […] Fred MacMurray is fine, if a bit too low key in places. Lesley Ann Warren makes an auspicious and appealing debut, and Geraldine Page comes close to stealing every scene she’s in. Millionaire is perfectly acceptable family entertainment but nothing more.” Craig Butler: The Happiest Millionaire (Memento vom 1. August 2016 im Internet Archive) bei AllMovie (englisch)