I find it extremely entertaining and it never gets boring for me, and I never know what is going to happen next which always makes me look forward to the next episode.
Well, I don't watch light-hearted anime, and whenever I feel like watching one, I watch OP, because, in my opinion, it's one of the few good long ones out there.......
It is good and it does have some amount of supernatural activity which amuses me, as I am a vampire.
I like one piece, as it deals with positive emotions of humans.
To be honest, I mainly watch it because of its popularity... If it wasn't so popular and if it wasn't for the hype around it, I would probably consider it just another light-hearted anime that doesn't necessarily have to be on my 'to watch' list...