The artwork isn't the best in the industry (I didn't said it's bad), but the story and how it is told is something unique from this manga. Oda can make you like not only the main characters but the secondary ones too, each backstory has it's weight and lesson, I've cried and cheered inumerous times with this anime/manga and I hope I can keep doing this until its unavoidable end.
The present arch, Wano, which Oda said is going to be the best so far, is keeping its promisse, fantastic revelations and events are going on and it's still halfway through.