Reviews provided by RottenTomatoes
New York Times:
[Tashlin], as the writer, producer and director of the film, has let it go mushy and sprawling even more than the original play of George Axelrod.
Tashlin had a huge stylistic impact on the New Wave. Will Success Spoil Rock Hunter?, his greatest film, is the template for Godard's bold use of primary colors and 'Scope in the 60s.
The not inconsiderable charms of Jayne Mansfield are much to the fore, but it's Randall's performance as timid advertising executive Rockwell Hunter that holds the whole thing together.
[Mansfield] constantly catches you off guard. She's this unabashedly crude movie's bleached-blond heart and soul.
In converting the stageplay Will Success Spoil Rock Hunter? to his purposes, Frank Tashlin turns out a vastly amusing comedy.