One Piece. When someone who hasn't watched OP hears One Piece, the first thing they think of is how long the series is. TL;DR at the end.

Story: 10/10

Seems pretty simple, but the MC, Luffy, wants to become to Pirate King and have adventures with his friends/nakama. Basically to just have fun and chill with them. As the story goes on, new crewmates are recruited and their backstories are told. The main reason why I actually like OP is because of the incredible story telling and deep moments. I won't say anymore than that, I wouldn't want to spoil anything too much.

Art: 10/10

Not really much to say. The art starts to improve as the series goes on like most older mangas/animes, though sometimes criticized due to the females having over-sexualized bodies as the art style changes.

Character: 10/10

The amount of character development and usefulness of every and each single crewmate are one of the other main reasons OP is my top favorite series. Each crewmate has their importance in the series. Each character knows their roles in the crew, holding responsibility to carry their weight.

TL;DR and Overall rating: 10/10

One Piece is definitely worth the time. It stands as my top favorite. The story telling is incredible and the deep moments stand as it's equal. One Piece gets serious when they need to gets serious, but also gets nonchalant when the time is right.