Review aggregation website
Rotten Tomatoes gives the film an approval rating of 67% based on reviews from 144 critics, with an average rating of 6.31/10. The site's critics consensus reads: "Mamet's mixed marital[sic] arts morality play weaves between action and intellect but doesn't always hit its target."
Metacritic reported the film had an average score of 69 out of 100, based on 32 critics, indicating "generally favorable reviews". Many critics praised
Chiwetel Ejiofor for his performance in the film.
Los Angeles Times film critic Carina Chocano described the film as "tricky and engrossing" and "a contemporary noir with a samurai movie interior." Chocano wrote, "Ejiofor brings a calm magnetism and a beatific serenity to his roles that have the effect of knocking you flat -- there's something about this guy that's messianic." While citing Tim Allen's performance as restrained, Chocano wrote "the noir puzzle element is central to the story" and "suffice it to say things get complicated," saying "much of the pleasure is in the surprises." Several critics called the story reminiscent of films from earlier decades. Ruthe Stein of the
San Francisco Chronicle said the film is "entertaining in a pulpy kind of way, like the fight films of the 1930s and '40s, and more accessible than most of Mamet's movies." Ty Burr of
The Boston Globe wrote "What
Redbelt reminded me of more than anything else was a modern version of a classic
film noir, particularly 1950's brilliantly seedy
Night and the City, with its pro-wrestling subplot." Manohla Dargis of
The New York Times called it "a satisfying, unexpectedly involving B-movie that owes as much to old Hollywood as to Greek tragedy." The ending of the film was criticized by several critics. Tasha Robinson of
The A.V. Club said "The film unravels a bit in the last few moments, amid unanswered story questions and a simplistic climax, but until that moment,
Redbelt is Mamet's richest film of the decade." Steven Rea of
The Philadelphia Inquirer said "One of the problems with the way Mamet resolves Mike's predicament is that it's ridiculously implausible - even in the context of a far-fetched fight story." Andrew O'Hehir of
Salon.com said the final scene "might seem far-fetched on a pay-per-view
MMA broadcast." Film critic
James Berardinelli said "The plot is borderline ridiculous and certainly doesn't stand up to close (or even not-so-close) scrutiny, but there's a level of entertainment to be had watching it unfold in all its strangeness," but also said "taken at face value, there's a degree of satisfaction in the way
Redbelt concludes." Regarding the fight scenes in the film, Rea wrote "Mamet is a master of talk, not action" and said "
Redbelt's ultimate Ultimate Fight moment feels sorely lacking." The film appeared on some critics' top ten lists of the best films of 2008. Tasha Robinson of
The A.V. Club named it the 4th best film of 2008, ==Box office performance==