In the later years of his career, John Lennon stopped wearing rose-tinted glasses when it came to the Beatles' songs — in particular, his own.
He continued to hold a warm spot for some of the group's' earliest tunes, like "All My Loving," and for a number of those from their later era, including "Strawberry Fields Forever," "In My Life" and "Hey Jude."
But he viewed many others with a critic's unsparing eye. His most withering condemnations were saved for songs that were stamped out in cookie-cutter form or peeled off as nonsensical filler. "It's Only Love" is an example of the former, a Help! track he called “abysmal”, while the latter includes Abbey Road's "Mean Mr. Mustard," a bit of light-hearted fluff he denounced as “a piece of garbage.”
And then there's the song Lennon called his “least favorite.” It appeared on the group's 1965 album Rubber Soul, which may seem odd, given that record's status as the group's first conceptual work, in which every song received its own well-considered musical arrangement.
Source: guitarplayer.com/Phil Weller