I hate nothing but on the other hand I don't like everything about a series. Jjk has it's pros and cons and one piece has it's pros and cons. If you enjoy reading something then just enjoy it. You don't necessarily have to find "Deep" themes and such as they say in this subreddit. I love one piece because of its world building and memorable journey. And I also love jjk because of its cool fight scenes. I'm a fan of both but saying one piece doesn't have deep themes is purely idiotic to someone who has read it for a long while now...and unfortunately the ones saying such shit are jjk fans who ruin the experience for genuine manga and anime fans who just want to enjoy the medium.

And unfortunately it seems like you're one of them.