The merit of this film is that it preserves for posterity one of Broadway's longest running comedies, with only minimal changes from the stage version. That is not an insubstantial contribution, and the movie deserves credit for letting us experience much of what 1,572 Broadway audiences witnessed.
That said, there is something impenetrable about watching Debbie Reynolds looking positively gorgeous as she tells Michael Rennie of the trials and tribulations of being a "plain" girl and woman. The part of Mary was written for Barbara Bel Geddes, who fit that dialogue perfectly (see her Midge in "Vertigo"). Debbie, on the other hand, was simply too radiant to give credibility to a character who supposedly compensated for insecurity about her looks with unceasing wit.
That said, there is something impenetrable about watching Debbie Reynolds looking positively gorgeous as she tells Michael Rennie of the trials and tribulations of being a "plain" girl and woman. The part of Mary was written for Barbara Bel Geddes, who fit that dialogue perfectly (see her Midge in "Vertigo"). Debbie, on the other hand, was simply too radiant to give credibility to a character who supposedly compensated for insecurity about her looks with unceasing wit.