I understand the debate surrounding casting choices in this entertaining adaptation of Damon Runyon's stories, but I believe they made the right decisions. Frank Sinatra portrays "Nathan Detroit," the man running a well-known weekly crap game in New York City. This week, however, with important visitors including the renowned "Sky Masterson" (Marlon Brando) arriving, he’s struggling to find a location unless he can secure $1,000. It's a frustrating situation! Meanwhile, Brando makes a wager that he can persuade Sergeant “Sarah Brown” (Jean Simmons), a prim and proper local Christian mission worker, to accompany him to Havana. Almost everything is subject to a bet in this film... What I find particularly noteworthy is the emphasis on the male characters; there aren’t many of the usual elaborate dance numbers; and the characterizations feel more impactful—especially Brando's and Simmons' portrayals – and that casting seemed to prioritize cinematic appeal over box office star power. Of course, it’s clear Marlon Brando wasn’t born to sing; but that didn’t hinder his performance of Frank Loesser’s "Luck be a Lady," which possesses a certain charm and spirit that might not have come from someone with more formal musical theater training. Similarly, Jean Simmons does a good job as the rigid religious figure while beautifully performing “A Woman In Love” & "Follow the Fold" alongside Brando. Sinatra is perfectly suited to his role, singing with Vivian Blaine, who gives a wonderful recreation of her 1950 Broadway performance as his often-frustrated girlfriend, accompanied by an excellent song and dance number in "Pet Me Poppa." Ultimately, I feel that Stubby Kaye ("Nicely-Nicely") deserves the most praise for his outstanding group performance of “Sit Down You're Rockin' the Boat.” The film does suffer from a lack of chemistry between the two main characters, which is noticeable—at times they seem like bickering felines—but overall it’s a fast-paced and stylish take on gangsters and con men that definitely made me smile and want to tap my feet.

Source on TMDB