I guess the most zealous of Paul McCartney haters would drag out the Mull of Kintyre car-crash-of-a-song. They'd be right to do so. I am not willing to accept that he might have been suffering an exotic form of dementia when producing that monstrosity. He was suffering a severe case of pig-eye and just figured that if he could make his song annoying and catchy enough, then some poor cake-brain would buy it.
As for Paul McCartney's personal relationships, I suspect that many of Heather Mills' rants were well founded. He treated Dot Rhone like a Labrador - then Jane Asher in the same way. He forgot about Linda in a heartbeat and generally asked for it with Heather.