Now, time for the actual review.
Story: One Piece starts off very slow, when it comes to the storyline, but it improves as times go on. The story in One Piece can not be explained in 200 or even 300 episodes unlike some animes. The world is so complex and the story just adds to the world itself. Keep in mind that, One Piece does geniunly excell at story in later episodes, such as my personal favorite, Alabasta Arc!
Art: One Piece is not known because of it's art style. In fact, I would call it mediocre. I don't personally favorite the art style, but it's better than some other animes I have watched.
Sound: The soundtrack for this anime is very good. It provides decent OST's which makes the anime way more exciting and impressive. I want to say though that the soundtracks do get repetitive as time goes on. Each character also has their own music track apparently because of the mid-show cutscenes which depict the character, and their own music which is fun to guess for me.
Character: I don't know how to stress this enough! The character's in this show are off the hook! The charcacter development stems way beyond any other anime or manga I have watched/read. You may become so attached to the characters, you might start hating the villians because you hope they won't sever that connection you have with those characters.
Enjoyment: This anime get's a nine for enjoyment. I know what all of you fans are saying though, "WTF!??" and "WHAT IS WRONG WITH YOU!??" because One Piece deserves a 10. The only reason I put a 9 was because of the starting episodes, and other than that this definitely is pure awesomeness. This world is so enjoyable and so are the characters. In fact, I would say it's easy to get addicted to One Piece! The beginning episodes though, not so much! Some people might say though, that the story is slow-paced, so they don't like it, but the story must be slow-paced in order to explain this magnifecent world!
Overall: One Piece is amazing in it's own ways, but does have flaws in it's own ways too. The pro's outnumber the con's though, but there are still a bunch of cons. This world truly is worth giving a try, but be warned if you don't like the first 100 episodes, just quit! I give this a 9!
