Daddy Pig is fat, useless, convinced he's an expert in everything but failing every time. His parenting skills hover around 0, and always needs to be rescued, usually by Mummy Pig. So much for healthy co-parenting.
Furthermore, Peppa is mean to her friends, who like her regardless, she always gets special treatment.
I'm not saying there isn't a lot of good stuff in PP, there is for sure, but the issues above feature in every episode and they really get to me now.