I read this series a while back, in college, but have every intention of reading it again. The themes of this story are well developed from chapter one, and though at some points the story is rehashed, there is no point within the story in which a main character is not developing, and that forward progress drives the story to the end. This is accentuated by the lack of growth by the main character Kitano, his ally Kuroda, and select villains throughout the series. Kitano, the subject of his community's pity and fear, is completely unscathed by it emotionally, as he doesn't even recognize it for what it is. Instead, Kitano is physically battered during the course of the story, taking on physical scars in place of emotional ones, and growing stronger, until he is as adept physically as he was at heart from the first page of the story. Meanwhile, other characters who were physically strong the entire series grow as characters until they are able to see the world in a similar way to Kitano.
I have to reread in order to get many of the details correct, but it won't be an issue. While the art is rough at first, it improves dramatically over the series, and even at its worst, it depicts a more realistic world without crazy hairstyles and obnoxious clothes, which serves to accentuate those few details which are outliers, such as Kitano and his number 2, Takehisa.
I won't bore you any further. I may be doing this story a disservice by describing it five years after reading it, but I can say without a doubt that this is a good read worth investing some time in. Read the first arc. If you don't like it, you don't have to continue. If you are pulled into it though, prepare for a touching story.