What killed this series for me, is the early demise.
STORY: 6
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The story started off pretty well done. However, it did not have room to finish out it's planned story, due to the early demise of Jump X, the magazine it was serialized in. Therefore, it has tons of holes, and things are left unresolved.
ART: 7
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I've always loved Hiroyuki Takei's art, even in the beginning of Shaman King. However, sometimes the faces are a bit weird, and proportions are off.
CHARACTERS: 8
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The characters, for the 29-chapter-span of the series, were pretty well done. You could tell that each had a decent backstory planned, but were not given enough time to explain them.
ENJOYMENT: 9
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I awaited each chapter, every month, with a watering mouth. The cliffhangers were amazing, and kept you on the edge of your seat throughout all 29. Plus, getting to see an important returning figure (not ruining who), was a major plus to that, as well.
OVERALL: 8
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As I said, everything about the series was good, but it's early death killed it's popularity, bad. All in all, despite the score I am giving it, I would not recommend it, since it is an incomplete work. If you're looking for a continuation of SK, I would read the Funbari Hotsprings side-story, that is centered around Ryu and Hana searching for the "legendary warriors," and end it there.