Except maybe for Ricky Skaggs, this folksy eccentric sings fewer embarrassing songs than anyone in country music. Unlike Skaggs, he plays at innocence rather than striving for it, which is why there always seems to be something comic bubbling under the eager warmth of his voice. And as you soon learn from lyrics like “Black Sheep” and “Swingin’,” he’s unlike Skaggs in another way as well: he’s not a moralistic tight-ass
~Robert Christgau (about JA’s “Greatest Hits”)
… Lennon presents everything on the surface, and the song titles — “Mother,” “I Found Out,” “Working Class Hero,” “Isolation,” “God,” “My Mummy’s Dead” — illustrate what each song is about, and charts his loss of faith in his parents, country, friends, fans, and idols. It’s an unflinching document of bare-bones despair and pain, but for all its nihilism, it is ultimately life-affirming; it is unique not only in Lennon’s catalog, but in all of popular music. Few albums are ever as harrowing, difficult, and rewarding as John Lennon/Plastic Ono Band.
~Stephen Thomas Erlewine (allmusic.com)