Some things:
~ Sign me up for the foot in the groin to the "boy band" revisionists. I'll wear my steel-toed boots.
~ The Playboy interview took place immediately before Lennon was murdered. Not in the early '70s. I believe it was printed in the January 1981 issue.
~ Paul doesn't read music.
~ Paul was the best, most versatile player, and the most prolific writer (and the smoothest singer) in the band. But, for one thing, Lennon knew how to fingerpick a guitar, which McCartney has never learned. And, in addition to guitar, he did play harmonica and piano, and naturally, always added exactly the right touch to make a song. I remember reading about how Paul's "Obla-Di, Obla-Da" was sitting there, flat, until Lennon sat down at the piano and made it come alive.
~ As someone said, Lennon was a complicated guy. He could be very jealous, spiteful, even sadistic, but also express great tenderness in his music (e.g. "Julia"). Ringo has said that he thought John was a lovely guy underneath it all. Remember that John had significant problems growing up (never knew his father, felt abandoned by his mother, witnessed her death at the hands of a drunk driver when he was 15 and just getting to know her). Also, by the time of the White Album, he was in love with Yoko Ono as well as using heroin, and he was losing interest in the Beatles. Paul was the one who was determined to keep things together, and, from what I understand, his obsessiveness started to become more than a bit annoying, to both Lennon and Harrison. I think Lennon tried to have it both ways by exerting comparatively very little effort on the band by that time, and then turning around and complaining about Paul being the taskmaster who (paradoxically) did an offhand job on John's songs. I think it was Geoff Emerick (or maybe George Martin) who said that John liked to work very quickly, and then lost interest, while Paul would, indeed, stay late to make sure that everything sounded good.
~ Lennon often expressed his preference for '50s-style rock and roll, yet he created some of the most visionary Beatles songs. Contrary to popular opinion, he also created some of the most beautiful Beatles melodies ("Norwegian Wood", "A Day in the Life", "If I Fell", the aforementioned "Julia", "Girl", "In My Life", etc., etc.). He also had a way of discovering some amazing, fresh chord progressions and modulations that, to me, equalled Paul's more polished, Mozart-like mastery of music.
~ What can you say? They were the greatest band and the most fascinating combination of musicians.