MCMXC a.D. was met with generally positive reviews from
music critics. Danny Serbib of
Colorado Springs Magazine said that by adding Gregorian chant to the album, "[Cretu had] redefined the possible future of popular music."
AllMusic critic Ned Raggett said, "Michael Crétu's attempt at fusing everything from easy listening sex music and hip-hop rhythms to centuries-old Gregorian chants could not have been more designed to tweak the nose of high art." Marisa Fox wrote, for
Entertainment Weekly, that while the album doesn't have as many accessible hits as other ones, "[the] journey through what the group calls 'music, spirit, and meditation' is entrancing as well as provocative." In contrast, Brian Bourke, in the
Syracuse Herald-Journal, stated that "once the novelty of Enigma's approach wears off", the rhythms underneath the songs have a sameness that is "irritating" in his eyes, with the exception of "The Rivers of Belief".
The Village Voice critic
Robert Christgau asserted that the "mellow electrobeat and Gregorian fog" of "Sadeness (Part I)" "provide[s] mutual relief", and suggested the other songs are disco filler with sexual content that is too lacking in vulgarity for his tastes. ==Commercial performance==