I will say this. There are things I like about Parelli at least at level 1 which is all that I've watched but there are also many things I like about CA, Chris Cox, and Stacey Westfall. I think they all have things to bring to the table and I think hating on one particular trainer because of his marketing methods and/or poor riding ability doesnt mean they don't have something good to share it just means take any trainers advice with a grain of salt if you are not getting one on one time with that trainer.
Im not about to hate on PP or CA. They are both accomplished trainers and you can dislike things about them or the way they handle themselves but they still have well trained horses.
"For I know the plans I have for you," declares the LORD, "plans to prosper you and not to harm you, plans to give you hope and a future." Jeremiah 29:11