Critical response
Black Swan received positive reviews from critics upon release, with praise toward Aronofsky's direction and the performances of Portman, Kunis and Hershey.
Review aggregator Rotten Tomatoes gives the film an approval rating of 85% based on 318 reviews, and an average rating of 8.20/10. The website's critical consensus reads, "Bracingly intense, passionate, and wildly melodramatic, Black Swan glides on Darren Aronofsky's bold direction—and a bravura, tour-de-force performance from Natalie Portman." At Metacritic, which assigns a weighted average score out to reviews, the film received an average score of 79 out of 100, based on 42 critics, indicating "generally positive reviews".
In September 2010, Entertainment Weekly reported that based on reviews from the film's screening at the Venice Film Festival, "[Black Swan] is already set to be one of the year's most love-it-or-hate-it films." Leonard Maltin, on his blog Movie Crazy, admitted that he "couldn't stand" the film, despite highly praising Portman's performance. Reuters described the early response to the film as "largely positive", with Portman's performance being highly praised. The Sydney Morning Herald reported that "the film divided critics. Some found its theatricality maddening, but most declared themselves 'swept away'."
Kurt Loder of Reason called the film "wonderfully creepy", and wrote that "it's not entirely satisfying; but it's infused with the director's usual creative brio, and it has a great dark gleaming look". Mike Goodridge from Screen Daily called Black Swan "alternately disturbing and exhilarating" and described the film as a hybrid of The Turning Point (1977) and Polanski's films Repulsion (1965) and Rosemary's Baby (1968). Goodridge described Portman's performance, "[She] is captivating as Nina ... She captures the confusion of a repressed young woman thrown into a world of danger and temptation with frightening veracity." The critic also commended Cassel, Kunis, and Hershey in their supporting roles, particularly comparing Hershey to Ruth Gordon in the role of "the desperate, jealous mother". Goodridge praised Libatique's cinematography with the dance scenes and the psychologically "unnerving" scenes: "It's a mesmerising psychological ride that builds to a gloriously theatrical tragic finale as Nina attempts to deliver the perfect performance."
Kirk Honeycutt of The Hollywood Reporter gave the film a mixed review. He wrote, "[Black Swan] is an instant guilty pleasure, a gorgeously shot, visually complex film whose badness is what's so good about it. You might howl at the sheer audacity of mixing mental illness with the body-fatiguing, mind-numbing rigors of ballet, but its lurid imagery and a hellcat competition between two rival dancers is pretty irresistible." Honeycutt commended Millepied's "sumptuous" choreography and Libatique's "darting, weaving" camera work. The critic said of the thematic mashup, "Aronofsky ... never succeeds in wedding genre elements to the world of ballet ... White Swan/Black Swan dynamics almost work, but the horror-movie nonsense drags everything down the rabbit hole of preposterousness." Similarly, in a piece for The Huffington Post, Rob Kirkpatrick praised Portman's performance but compared the film's story to that of Showgirls (1995) and Burlesque (2010) while concluding Black Swan is "simply higher-priced cheese, Aronofsky's camembert to [Burlesque director Steve] Antin's cheddar". Vulture's Kyle Buchanan also noted the similarities of the film's plot to the widely derided Showgirls, and said that the director Darren Aronofsky "owes a feather-tip to Paul Verhoeven's exploitation classic more than [he] might be willing to admit".
The film has been criticized for its portrayal of ballet and ballet dancers. Upon the film's release in the United Kingdom, The Guardian interviewed four professional ballet dancers in the UK: Tamara Rojo, Lauren Cuthbertson, Edward Watson, and Elena Glurjidze. Rojo called the film "lazy ... featuring every ballet cliche going". Watson felt that the film "makes [ballet] look so naff and laughable. It doesn't show why ballet is so important to us—why we would want to try so hard." The Canadian Press also reported that many Canadian ballet dancers felt that the film depicted dancers negatively and exaggerated elements of their lives but gave Portman high marks for her dance technique. In an interview with the Los Angeles Times, Gillian Murphy, a principal dancer with American Ballet Theatre praised the visual elements of the film but noted that the film presentation of the ballet world was "extreme".
Several critics noted striking similarities between Satoshi Kon's 1997 anime film Perfect Blue and Aronofsky's Black Swan. In response to comparisons between Perfect Blue and Black Swan, Aronofsky acknowledged the similarities in 2010, but denied that Black Swan was inspired by Perfect Blue. Kon noted in his blog that he had met with Aronofsky in 2001.
Amy Westcott is credited as the costume designer and received several award nominations. A publicized controversy arose regarding the question of who had designed 40 ballet costumes for Portman and the dancers. An article in the British newspaper The Independent suggested those costumes had actually been created by Rodarte's Kate and Laura Mulleavy. Westcott challenged that view and stated that in all only 7 costumes, among them the Black and White Swan, had been created in a collaboration between Rodarte, Westcott, and Aronofsky. Furthermore, the corps ballet's costumes were designed by Zack Brown (for the American Ballet Theatre), and slightly adapted by Westcott and her costume design department. Westcott said: "Controversy is too complimentary a word for two people using their considerable self-publicising resources to loudly complain about their credit once they realized how good the film is."
ABT dancer Sarah Lane served as a "dance double" for Portman in the film. In a March 3 blog entry for Dance Magazine, editor-in-chief Wendy Perron asked: "Do people really believe that it takes only one year to make a ballerina? We know that Natalie Portman studied ballet as a kid and had a year of intensive training for the film, but that doesn't add up to being a ballerina. However, it seems that many people believe that Portman did her own dancing in Black Swan." This led to responses from Benjamin Millepied and Aronofsky, who both defended Portman, as well as a response from Lane claiming that she has not been given due credit.