Actually, the later in their career you go the easier it gets to find bad songs.
Love Me DO and
Please, Please Me, thjeir first two British singles sound terrific, but try listening to
For the Benefit of Mr Kite. Yeccch! And on their last albums they wouldn't even record finished songs, just scraps of half-baked ideas connected into medleys which made little sense musically or otherwise.
Here by the way is an interesting article that sums up things fairly well, and might actually deserve its own thread of exchanged insults here.