The film is a satirical mockumentary about Dax Shepard's transformation from comedian to a silver screen martial arts star.

[3] Dennis Harvey of Variety wrote "It's an easy watch that nonetheless consistently feels like a grazing blow rather than a knockout".

[4] Nick Schager of Slant Magazine added his criticism of the film, stating "Dax Shepard delivers an I'm Still Here-style mockumentary of staggering incompetence with Brother's Justice".

[7] The Village Voice's Aaron Hillis compared Brother's Justice to an overlong episode of Curb Your Enthusiasm, adding that unlike that show "this film has none of the wit and is twice as irritating".

[8] According to Gary Goldstein of the Los Angeles Times "It's better to revisit such memorable Hollywood satires as The Big Picture or For Your Consideration before indulging Shepard's uninspired whimsy".