Disclaimer: English is not my first language, therefore excuse me for any mistakes!

One Piece is the best piece of fiction I have ever experienced.
Starting watching and reading One Piece is the best decision of my entire life so far.
So, obviously, One Piece is my favourite manga and anime, my favourite series of all time. As a result, this review will be very subjective and full of good things to say.

Story: 10/10
The storytelling of Oda is a gift from the Gods. The way how something mentioned in a chapter will become relevant 300 or 500 chapters later is incredible! Every chapter and arc introduces a lot of new mysteries, every character has something to do with another, who you did not expect. The worldbuilding is fascinating, the world is in a perpetual expansion, every faction has its own motives, its own good guys and its own bad guys.
This story has adventure, action, comedy, drama and everything someone would want! When Oda wants you to cry, then you will cry. The flashbacks and backstories are heartbreaking. The level of foreshadowing that is put in this manga is insane.

Art: 10/10
Even if at the beginning the art style seems a little simplistic, it becomes one of the best parts of the story. The visuals on a double spread page are breathtaking. The quantity of characters and the beauty of the backgrounds, the movement, everything is done perfectly! One of the best things about this manga is that every cover page has something to do with the actual story. Sometimes Oda will take cute and funny requests from the fans that he will draw in the cover page in a few chapters, then he will draw a cover story, showing what are other characters doing when they are not present in the actual arc. Oda is advancing the story with a few pages. Moreover, the colour spreads are fabulous! One of the coolest things is to see the Straw Hats chilling together with some animals or going into new adventures, flying or eating pizza.

Character: 10/10
Even if One Piece is a story-driven series, the characters are all well developed and their progression and evolution are on point. The members of the Straw Hat crew will keep their basic personality traits, quirks and running gags, but they will each grow as an individual and learn during their journey together. When we meet a new character, we are all waiting to see their backstory, what motivates them to do what they are doing, their reasons to act as they do. Seeing them grow as a family is a precious thing to me. One Piece can become dark at some points, especially in the flashbacks to show us how cruel the world is, how corrupt the government is and how everything it affects the characters and the story. The world is moving alongside the characters and at the same time completely separate from them.

Enjoyment: 10/10
Of course, it is my favourite series. I will continue reading and watching it until the end and every week I am so hyped for a new chapter.

Overall: 10/10
I recommend One Piece to everyone. If you like complex shounen manga, with pure gold comedy, beautifully written characters, lots of adventures every new arc, cool and meaningful fights, worldbuilding from the hands of gods, storytelling never seen before and heartbreaking drama, then One Piece is for you without a doubt.
Read the first 100 chapters or go watch the special Episode of East Blue. If the story does not appeal to you, then One Piece is not for you. I guarantee you that once you start this journey, you will not stop and you will not regret it.

The manga can have slow pacing sometimes, which can be irritating, but I believe that One Piece is made to be binged. If you read 10-20 chapters a day, you will be able to truly experience the greatness that is this series.