Probably the best thing about this manhwa are the characters, particularly the main, Rotto (or Lotto). After a while you just get tired of your classic shounen justice focused leads and Rotto is about the closest thing to a cure as you'll find. You wont hear a "must save everyone" speech from this guy. He'd probably sacrifice his friends for a power-boost if he could-without asking first. He's pretty evil, and maybe not the brightest tool in the shed when it comes to interpersonal relations, but he's actually relatively smart, which is a plus. He's one of those character that even if everyone he crosses in his world will hates him after, you wont.
All of the characters are pretty extreme, but it helps to keep them unique from each-other. Although the art might not be to everyone's liking, its really quite good in its own way. Particularly in that the artist is able to differentiate her characters in ways other than hairlenght. This is a rare manga that even if a you haven't seen a character for volumes chances are you'll remember them (even if your character/person remembering skills are as bad as mine). They're all "endearing" in their own way and the story would feel like its missing something if they weren't there. Even the extremely minor ones.
The biggest problem I find with this series is that its a bit slow. It can spend volumes on something that could have been substantially compressed. In particular, the series spends way too much time (I find) twiddling its thumbs between major events. You can expect volumes of interlude material between the conclusion of one major issue and the start of the next. Admittedly its during these times a lot of character information is released, but it makes things feel choppy and a tad tedious. A battle of epic proportions is looming on the horizon and you'll be continually informed of this, but you'll have to wade through 3 volumes of characters talking and hypothesizing (and mauling each other). You just start thinking "get on with it already, I want to see something get smashed other than Boromir's face (which is still amusing 25 volumes later)."
Overall I'd give it and 9.
The art is pretty nice: the characters are recognizable and if you shaved everyone you'd still be able to tell them apart, action is clear and fluid, and I find the style to be pleasing. 9/10
Characters: Rotto is awesome and rest are all memorable. However, other than maybe Rotto and Yureka there isn't a whole lot of character development and they're all pretty flat. They're who they are and they stay that way. However, they're all interesting enough and don't follow flat archetypes so you don't get bored of them. 9/10
Story: The overall plot (once you get there) is pretty cool and takes on vast proportions. Due to the extreme nature of the characters the plot isn't as predictable as most other shounen, though you may have a vague idea of where things are going. Unfortunately its a bit stop-go in nature. 8/10
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