Ok so I gave 10s to all: story, art, character, enjoyment, and overall.
I gave this manga a 10 even though it deserves, like, 1000.
One Piece is a battle mainstream manga. It is full of action and fights, and at first glance might seem stupid and random, but oh gods believe me, this is so very likely to be the BEST battle shounen manga you guys will have ever read. Widely classified as the top three most popular battle series alongside Naruto and Bleach, I've got to admit that One Piece is just.... way above those two. One Piece stands on top, the pinnacle of perfection, so posh and fabulous and flawless and pretentious.
Story - The story tells us about the adventure of Monkey D. Luffy, a very fiery young boy who dreams to be the Pirate King. The story starts from when he first set sail, and he gradually collects one member at a time to join his pirate crew. To me the story is original (I mean, who talks about pirates nowadays?) and the execution is nothing less than PERFECT. Can't talk about all the arcs because this manga has more than 700 chapters at the moment, but from the very start, when Luffy met the first man to join his journey, from that time on, the story progressed real smoothly, and real intriguing.
One Piece is one of the most complex series I've ever read-- it's full of unanswered questions at the moment. All the mysteries waiting to be solved-- ahh the thrill! Even though there are still so many holes until the main story is fully revealed, it doesn't make me feel agitated at all. My curiosity is perfectly fine and healthy, and I will patiently wait until everything gets explained. On the other side, I have a rather high expectation for the revelation, but looking at past experience and how Odacchi, the author, has brought the story so far, I have no complaints.
Odacchi also doesn't seem to run out of ideas. One Piece is overflowing with wild, wild imagination. So many awesome things support this manga and make it even more surprising. I mean how many people in this world would ever think of making snails as a medium of communication? How many people would ever create mermaids with specific fish types? How many people would ever think of creating the Void Century, mysterious devil fruits, poneglyphs, the Marines and their posh Justice cape, Will of D, Sea Kings, and Yarukiman Mangrove?? I suppose nobody but Odacchi could ever make these epicness possible.
Art - The art starts off rather funny and functional, but Odacchi has always had this intricate, unique style to his drawings that is impossible not to notice. As time flies and chapters by chapters go, the art metamorphosed into something, not entirely new, but more brilliant and more beautiful. The art is really cool and it goes really well with Odacchi's wonderful imagination. There are sceneries and odd stuffs drawn so well you can't help but go whooaaa. The only minus I can note is how Odacchi draws with such vigor the fight scenes can be really confusing if you're not following well. But it still doesn't change the fact that the art is amazing.
Character - One Piece as a long running series is also supported by its diverse characters. We have seen a lot, so much characters in more than 700 chapters and despite all of the cliches and the i-will-protect-my-nakama type of people, they are still real fun and real engrossing. Our main pirate crew even consists of three inhuman beings: a living skeleton, a talking reindeer, and a cyborg wearing Hawaiian Aloha shirt. What do you guys expect? Good characters don't always have to be humans yanno. There is Surume the kraken. Even Going Merry has her own human personification. I mean, I have so many characters in my mind when I want to write their names my mind go blank. But that's it. You guys take my point.
Enjoyment - F*ck, how I enjoyed this manga. I enjoyed it too much, in fact. This manga is just simply entertaining and every arcs will keep you glued to your seat. I spent so much words describing my feelings above I can't seem to make anymore words to express how I love this manga. In short, this is a real masterpiece that nobody should ever miss, regardless of whether this is their cup of tea or not. One Piece is exceptional. When you realized it, you'll find yourself craving for more, not wanting to stop.