Thaayillamal Naanillai offers a compelling storyline that blends emotional drama with moments of intense character development. The screenplay maintains a steady pace, with the first half effectively setting up the characters and their motivations, while the second half delves deeper into the conflicts and resolutions, keeping the audience engaged throughout.

The film's songs, composed by Shankar-Ganesh, complement the narrative well, with melodious tracks that enhance the emotional tone without disrupting the flow. The background score supports key scenes effectively, adding to the dramatic tension and emotional resonance.

Cinematography by P. N. Sundaram captures the rural and urban settings with equal finesse, contributing to the film's immersive atmosphere. While the pacing is generally consistent, certain sequences could have benefited from tighter editing to maintain momentum. Overall, the film balances its thematic elements with entertainment, making it a memorable entry in late 1970s Tamil cinema.

Kamal Haasan: Delivered a nuanced and emotionally charged performance, showcasing his versatility.

Sridevi: Brought charm and depth to her role, effectively portraying vulnerability and strength.

Rajinikanth: Provided a strong supporting role with his characteristic screen presence and intensity.

Nagesh: Added comic relief with impeccable timing, balancing the film's dramatic moments.