Ruth received a mixed critical reception. As a work that dealt frankly with seduction and illegitimacy, it inevitably attracted controversy: Gaskell reported that it was a "prohibited book" in her own household, that friends expressed "deep regret" at its publication, and that two acquaintances burnt their copies. On the other hand, some reviewers complained that Gaskell painted Ruth as too passive a victim of Bellingham's advances, eluding the question of Ruth's own sexual feelings. Gaskell loaded the story down with so many extenuating circumstances that Ruth scarcely seemed a representative example of a "fallen woman."

The book is a social novel, dealing with Victorian views about sin and illegitimacy. It is a surprisingly compassionate portrayal of a 'fallen woman', a type of person normally outcast from respectable society. It examines the social stigma of illegitimacy. Ruth goes on to gain a respectable position in society as a governess, and the novel looks at whether the sinful can be reintegrated into society.

Elizabeth Cleghorn Gaskell, née Stevenson (29 September 1810 – 12 November 1865), often referred to simply as Mrs Gaskell, was a British novelist and short story writer during the Victorian era. Her novels offer a detailed portrait of the lives of many strata of society, including the very poor, and are of interest to social historians as well as lovers of literature. Gaskell was also the first to write a biography of Charlotte Bronte, The Life of Charlotte Bronte, which was published in 1857.