Rajathi Raja is a quintessential 1980s commercial entertainer that perfectly leverages Rajinikanth's superstardom. The film employs the classic double-action trope, allowing the lead actor to showcase two distinct personas—the suave, urban Raja and the innocent, rustic Chinnarasu. The screenplay is structured to provide a mix of high-octane action, slapstick comedy, and emotional family drama, ensuring it appeals to a wide demographic.

The first half of the movie is light-hearted, focusing on the confusion caused by the lookalikes and the romantic subplots involving Radha and Nadhiya. The second half transitions into a more serious revenge drama, though it never loses its commercial flavor. The pacing is generally brisk, though some of the comedic interludes feel slightly elongated by modern standards.

Ilaiyaraaja's musical contribution is a cornerstone of the film's success. Songs like 'Meenamma Meenamma' and 'Vaa Vaa Vanji' were massive hits and remain popular decades later. The background score effectively heightens the tension during action sequences and adds weight to the heroic moments. While the plot is formulaic, the execution and Rajinikanth's magnetic screen presence make it a memorable watch.

Rajinikanth: Delivers a powerhouse performance in a dual role, effortlessly switching between the stylish Raja and the comical Chinnarasu.

Radha: Provides great energy and matches Rajinikanth's screen presence in the dance sequences.

Nadhiya: Charming and effective in her role, adding a touch of grace to the film.

Radha Ravi: A formidable antagonist who plays the villainous Valayapathy with the right amount of menace.

Janagaraj: Provides excellent comedic support, particularly in scenes involving the villager character.