Paul McCartney is an accomplished drummer! Here is a link so you can read about it: http://drummagazine.com/paul-mccartney-the-beatles-other-drummer/
It is certain that John Lennon was being perfectly frank and stating a simple fact which he had seen demonstrated many times. Paul McCartney is indeed the very best of all the drummers who ever played with the Beatles.
Never implied otherwise. The general consensus that I have seen from drummers on McCartney's drumming is that he is decent but not special. I don't recall ever seeing one say that he was better than Ringo.
It is certain that John Lennon was being perfectly frank and stating a simple fact which he had seen demonstrated many times.
Except the evidence suggests that Lennon never said that. Several Beatle historians and experts have tried to track down the quote and they all come to the conclusion that Lennon did not say it. The first time that the statement was clearly made was by British comedian Jasper Carrott in 1983 (and it was part of a joke).