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Thor Heyerdahl's Aku-Aku: The Secret of Easter Island is widely praised for its captivating storytelling and adventurous spirit, making it an engaging read that often feels more like a novel than a scientific expedition account. Reviewers highlight Heyerdahl's skill as a narrator, his humor, and his ability to transport readers to Easter Island, immersing them in its mysteries and the lives of its inhabitants. The book is lauded for offering fascinating insights into the island's archaeology, culture, and history, particularly through the author's interactions with the local people. Many found the detailed descriptions of the island's unique society and ancient practices to be particularly enriching, providing a foundational understanding of the region for those interested in exploration, anthropology, and historical puzzles.

However, the book also draws significant criticism, primarily concerning Heyerdahl's methods and the ethical implications of his expedition. A recurring concern is the author's manipulation of the islanders' beliefs and superstitions to gain access to their sacred family caves and acquire ancient artifacts. Reviewers express discomfort with what they perceive as trickery and a disregard for cultural patrimony, questioning the justification of such actions in the name of scientific study. Additionally, some readers found the writing to be repetitive, especially in the latter half, with too many similar accounts of cave explorations and artifact retrieval, which detracted from the pacing and overall enjoyment. There is also a notable critique that some of Heyerdahl's anthropological theories presented in the book have since been disproven, leading some to question the reliability of his conclusions.

Despite the ethical and structural criticisms, Aku-Aku remains an engrossing and highly recommended read for many. It is particularly suited for those who enjoy adventure narratives, archaeological expeditions, and learning about remote cultures, even if some of the scientific theories are now considered controversial. Readers with an interest in Easter Island's enigmatic history, its giant statues, and the daily lives of its people will find much to appreciate. While acknowledging the problematic aspects of Heyerdahl's approach, many reviewers ultimately value the book for its thrilling sense of discovery and its role in documenting a unique moment in the island's history, offering a window into a world of ancient traditions and beliefs.