There are three positive points about the film — catchy title, noble theme and the duration (1hr 40 minutes). But as a movie, Theru Naaigal lacks the spark to be an intriguing vigilante thriller. The writing lacks quality, except for Imman Annachi none of the actors including Mime Gopi, Madhusudhana Rao, and Appukutty attract us.
The film is also disjointed with a lot of characters and things begin to make sense only after the flashback, which comes only in the second half. For a thriller like Theru Naaigal, action sequences play a vital but here things are insipid and nothing really captivating.
Director Hari must be appreciated for trying to convey a much-needed message through a crisp film but he should work a lot in screenplay and execution to exactly bring his ideas on the big screen. The cinematography, music, and performances of the actors are also not up to the current Tamil film standards.
Overall, Theru Naaigal is a below average film with a good message.