3 stands out for its bold attempt to blend a romantic narrative with a sensitive portrayal of mental health issues, a relatively unexplored theme in Tamil cinema at the time. The story is engaging, with a screenplay that effectively captures the emotional turbulence of the protagonist. The pacing is well-maintained, with a gripping first half that establishes the characters and their chemistry, and a more intense, dramatic second half that deals with the complexities of Ram's condition.

The songs and music by Anirudh Ravichander became a massive highlight of the film, especially the viral hit "Why This Kolaveri Di," which gained international popularity. The soundtrack complements the narrative well, with the background score enhancing the emotional depth without overpowering the scenes. Cinematography by R. Velraj adds a naturalistic feel, supporting the film's intimate tone.

While the film's narrative and performances are strong, some viewers found the second half emotionally heavy and the climax heart-wrenching, which might not appeal to all audiences. Nonetheless, the film's attempt to address mental health with sensitivity and its memorable music contributed significantly to its impact.

Dhanush: Powerful and nuanced portrayal of Ram, convincingly depicting the emotional and psychological struggles of bipolar disorder.

Shruti Haasan: Expressive and heartfelt as Janani, effectively conveying the emotional support and turmoil in the relationship.

Sivakarthikeyan: Provides comic relief with a natural and engaging presence, balancing the film’s heavier themes.