I'm a student of Robert Duvall's career. The films he has personally written and directed tend to to quirky and the subjects are those in which he has a strong interest. He has spent a fair amount of time in Argentina, and has a passionate interest in the Tango. His leading lady later became his wife. My suspicion is that Duvall made this movie out of love and could care less if it made money. The opaque nature of the assassination side of the story fits right in with Argentine political history. The Tango portion of the film is very well done, and shows his love of the dance. In any case, the movie is worth watching if you are a Duvall fan.
Review of Assassination Tango
