Frank Sinatra's at his wholesome stage here, playing the same kind of role he played in Anchors Aweigh (1945) and On the Town (1949) (incidentally, this one was filmed in 1948 but held back from release). He plays the uncertain and anxious Johnny well enough, particularly when he's bouncing off Marx as Emile. Marx himself is excellent, stealing every scene.
My problem, surprisingly, was with Jane Russell. She was completely miscast. The character was weak and soppy for the most part without the attitude and humour I associate with Russell roles. She might've been billed first but it's easy to see this was a Sinatra vehicle and Russell didn't have much to get her teeth into until the last fifteen minutes or so.
The plot itself is flimsy and it only contains two songs but 'Kisses and Tears', the duet between Sinatra and Russell (see below) is quite good. Without the presence of Groucho Marx, though, I suspect this film would be much less enjoyable than it is.