I pretty much agree with that. As John said, Paul’s songs weren’t about anything, and the “we weren’t a very good band.” ;’) I dislike John’s politics (George was just an airhead, Ringo a drunk, Paul a superficial twit), but some of his tunes are, by and large, my only reason for listening to that band. “Rain” comes to mind. :’)
I've read and heard just about every interview Lennon gave and don't recall him ever saying they weren't a good band. In fact, in an interview contained in the Anthology album he states that in terms of a band, "nobody could touch us." Lennon did admit that the quality of their musicianship declined over time when they couldn't hear themselves playing any more due to the screaming. Anybody who thinks they weren't a good band should listen to their live performances on the BBC album.