I can never tell if Paul is a heel or the good guy. My gut tells me he's a heel deep down or at least has a very strong ego behind that peace and love exterior.
Listening to him in interviews I really want to like him, but there's just something.....
In John and Paul's defense Don't Let Me Down is a far superior song.
My impression for a long time has been that Paul's ego was a little too inflated. He made all this brilliant music but even today--by his continued self-references to his music in interviews--still seems to need adulation--needs assurance that his stuff was good. To be fair, there as been this idea floating around for years that Lennon's music was better--which is nonsense (to say that either one was a stronger songwriter than the other--they were individually, or in combination, nothing short of great).
My pet theory
Sgt. Pepper received great critical acclaim and it just so happened that (more than any Beatles record) it was a Paul record--and I think it went to his head a bit.