Interestingly, Lennon often criticized the Beatles after they broke up, but would staunchly defend them against outside critics. It was sort of the "I can make fun of my little brother, but you can't" mentality. I think he always felt like he had sold out, which (along with prolific drug use) is a reason he became so weird later. Being a member of the most successful and influential group ever apparently was not good enough for him.
One thing I remember from the (same?) interview is hearing Lennon say the Beatles broke up from “boredom” — after they stopped touring (1966 was the last tour) he said, pretending to check his watch, “time to cut another album.”