Frank McNally, writing in honour of the 100th anniversary of the author's birth, reflects on the breadth of the appeal of the series of novels, for the quality of the writing and the relationships between the characters, which put them beyond the typical naval adventure, and gain interest from readers who "wouldn’t touch Horatio Hornblower with a bargepole." Lucy Eyre wrote to point out the appeal of the series to women readers, mentioning the nautical detail, and how it might be viewed the same as precise medical language on the television program ER. She notes that "O’Brian is never heavy-handed with his research: it’s simply that the books are set in a perfectly realised world, which happens to be a ship at war."
