For me I never saw piplup as something to be hated , rather as the source of Humor that Ash is so sorely lacking.
I also never thought Trip was as bad as many people think he was or that May had gotten extremely powerful during her stint as MC.
I also like iris as a character except for the writers trying to take a shortcut on her development by dropping a dragonite into her lap.
There's more but what unpopular opinions regarding the anime that you have? ie not something the majority of people would agree with you on.