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Critical reception

The novella was not a big success during Conrad's life. When it was published as a single volume in 1902 with two novellas, "Youth" and "The End of the Tether", it received the least commentary from critics. F. R. Leavis referred to Heart of Darkness as a "minor work" and criticised its "adjectival insistence upon inexpressible and incomprehensible mystery". Conrad did not consider it to be particularly notable; but by the 1960s it was a standard assignment in many college and high school English courses.

Literary critic Harold Bloom wrote that Heart of Darkness had been analysed more than any other work of literature that is studied in universities and colleges, which he attributed to Conrad's "unique propensity for ambiguity". In King Leopold's Ghost (1998), Adam Hochschild wrote that literary scholars have made too much of the psychological aspects of Heart of Darkness, while paying scant attention to Conrad's accurate recounting of the horror arising from the methods and effects of colonialism in the Congo Free State. " Heart of Darkness is experience... pushed a little (and only very little) beyond the actual facts of the case". Other critiques include Hugh Curtler's Achebe on Conrad: Racism and Greatness in Heart of Darkness (1997). The French philosopher Philippe Lacoue-Labarthe called Heart of Darkness "one of the greatest texts of Western literature" and used Conrad's tale for a reflection on "The Horror of the West".

Heart of Darkness is criticised in postcolonial studies, particularly by Nigerian novelist Chinua Achebe. In his 1975 public lecture " An Image of Africa: Racism in Conrad's Heart of Darkness ", Achebe described Conrad's novella as "an offensive and deplorable book" that de-humanised Africans. Achebe argued that Conrad, "blinkered... with xenophobia", incorrectly depicted Africa as the antithesis of Europe and civilisation, ignoring the artistic accomplishments of the Fang people who lived in the Congo River basin at the time of the book's publication. He argued that the book promoted and continues to promote a prejudiced image of Africa that "depersonalises a portion of the human race" and concluded that it should not be considered a great work of art.

Achebe's critics argue that he fails to distinguish Marlow's view from Conrad's, which results in very clumsy interpretations of the novella. In their view, Conrad portrays Africans sympathetically and their plight tragically, and refers sarcastically to, and condemns outright, the supposedly noble aims of European colonists, thereby demonstrating his scepticism about the moral superiority of European men. Ending a passage that describes the condition of chained, emaciated slaves, Marlow remarks: "After all, I also was a part of the great cause of these high and just proceedings." Some observers assert that Conrad, whose native country had been conquered by imperial powers, empathised by default with other subjugated peoples. Jeffrey Meyers notes that Conrad, like his acquaintance Roger Casement, "was one of the first men to question the Western notion of progress, a dominant idea in Europe from the Renaissance to the Great War, to attack the hypocritical justification of colonialism and to reveal... the savage degradation of the white man in Africa." Likewise, E.D. Morel, who led international opposition to King Leopold II 's rule in the Congo, saw Conrad's Heart of Darkness as a condemnation of colonial brutality and referred to the novella as "the most powerful thing written on the subject."

Conrad scholar Peter Firchow writes that "nowhere in the novel does Conrad or any of his narrators, personified or otherwise, claim superiority on the part of Europeans on the grounds of alleged genetic or biological difference". If Conrad or his novel is racist, it is only in a weak sense, since Heart of Darkness acknowledges racial distinctions "but does not suggest an essential superiority" of any group. Achebe's reading of Heart of Darkness can be (and has been) challenged by a reading of Conrad's other African story, " An Outpost of Progress ", which has an omniscient narrator, rather than the embodied narrator, Marlow. Masood Ashraf Raja has suggested that Conrad's positive representation of Muslims in his Malay novels complicates these charges of racism.

In 2003, Motswana scholar Peter Mwikisa concluded the book was "the great lost opportunity to depict dialogue between Africa and Europe". Zimbabwean scholar Rino Zhuwarara, however, broadly agreed with Achebe, though considered it important to be "sensitised to how peoples of other nations perceive Africa". The novelist Caryl Phillips stated in 2003 that: "Achebe is right; to the African reader the price of Conrad's eloquent denunciation of colonisation is the recycling of racist notions of the 'dark' continent and her people. Those of us who are not from Africa may be prepared to pay this price, but this price is far too high for Achebe".

In his 1983 criticism, the British academic Cedric Watts criticises the insinuation in Achebe's critique—the premise that only black people may accurately analyse and assess the novella, as well as mentioning that Achebe's critique falls into self-contradictory arguments regarding Conrad's writing style, both praising and denouncing it at times. Stan Galloway writes, in a comparison of Heart of Darkness with Jungle Tales of Tarzan, "The inhabitants, whether antagonists or compatriots, were clearly imaginary and meant to represent a particular fictive cipher and not a particular African people". More recent critics like Nidesh Lawtoo have stressed that the "continuities" between Conrad and Achebe are profound and that a form of "postcolonial mimesis" ties the two authors via productive mirroring inversions.