Lennon wa sbetter than McCartney at writing lyrics that hit a note, but most of his music writing is pretty basic.
He was a junkie, repeatedly unfaithful, occasionally violent and a poor father, but I don't know if that makes him evil enough to be pope...
But McCartney was better at writing songs that people liked. It does annoy me that people say how great Lennon was, yet its obvious which songs were his, and which were Pauls (who sang it was usually a giveaway, especially on later songs).
Paul wrote the more popular stuff, John wrote the weirder stuff. Pretty much a reflection of their solo careers as well, with Paul having far more singles chart friendly songs!
But once again, who cares what he was like in real life? And whos to say its all 100% true anyway?