[5] Bennett reviewed The Engagement alongside William Eskridge and Christopher Riano's Marriage Equality: From Outlaws to In-Laws.

He concluded from Issenberg's account that the same-sex marriage movement was shaped by opposition from conservatives, funded by wealthy gay donors, and predominantly white.

[8] Kati described The Engagement as "a comprehensive work of civil rights history that is sure to interest political and legal enthusiasts".

[9] McBroom called the book an "exhaustive, detailed, and authoritative overview", commending Issenberg's "nuanced and insightful reporting".

[10] The Publishers Weekly reviewer commented that the level of detail provided "slows the proceedings somewhat", but praised the book as "a definitive portrait of a key victory in the battle for LGBTQ rights".