Arunachalam offers a blend of comedy, action, and drama, characteristic of Rajinikanth's films from the 1990s. The screenplay by Sundar C is engaging in the first half, with a brisk pace that effectively establishes the premise and characters. However, the second half tends to slow down, with some repetitive sequences that slightly affect the overall momentum. The story, while entertaining, follows a predictable pattern but is elevated by Rajinikanth's charismatic performance.

The songs composed by Deva are catchy and well-integrated into the narrative, with memorable tunes that complement the film's mood. The background score supports the emotional and action sequences effectively, enhancing the viewing experience. Cinematography by U. K. Senthil Kumar captures the vibrant settings and adds visual appeal to the film. Overall, Arunachalam is a commercial entertainer that balances humor and sentiment, though it occasionally leans on formulaic elements.

Rajinikanth: Charismatic and commanding, Rajinikanth carries the film with his signature style and screen presence.

Rambha: Provides a lively and charming performance as the female lead.

Soundarya: Delivers a sincere and engaging supporting role.

Raghuvaran: Effective as the antagonist, adding tension to the story.