Peter Bogdanovich's attempt to direct a homage to the great musicals of the 1930s is now remembered as one of the embarrassments of the 1970s. The film's thin plot, standard for the genre, centers on the romantic entanglements and misunderstandings among six stock characters: the bored playboy (Burt Reynolds), his never-ruffled valet (John Hillerman), the debutante (Cybill Shepherd), the Broadway diva (Madeline Kahn), her gambler boyfriend (Duilio Del Prete), and her maid (Eileen Brennan). All six are likely to burst into song and dance at any time, and they often do (the performances were recorded live on the set, not pre-recorded), but sixteen Cole Porter tunes, lavish sets and costumes, and an expensive production cannot hide the fact that Reynolds and Shepherd, the two leads, are way out of their depth. A notorious failure, At Long Last Love left a permanent stain on Bogdanovich's career.
~ Don Kaye, All Movie Guide