Mugen no Juunin came to its end. Samura Hiroaki managed to create great piece of art, so it’s not such a bad idea to recall this long and magnificent journey. I re-read whole thing (again) and decided to write some thoughts about different story arcs (possibly with no actual spoilers) because Samura changes not only "mood" and "feel" from arc to arc but even "storytelling" to some point and to be completely honest, even quality of arc differs. Still, I wouldn't dare to forget that it's overall "result" what matters and I can tell you right away that Mugen no Juunin is great read.
Introduction Arc - As expected, here Samura introduces basic storyline, characters, their motivations, pasts and relationships. It's not surprising that this is the weakest part of whole story. Oneshot stories where only point is to kill whoever is the villain at the moment. It works fine as introduction but I remember asking myself years ago if this is really that "great and mature manga" which my friend recommended to me. Luckily enough the last part of this arc improves exponentially and sets up fluent pass to the next part.
Mugai-ryuu Arc - Here things finally starts to be good. Here comes the true genius of Samura Hiroaki's storytelling. While first arc served for introduction of characters, their beliefs, motivations and desires, this one starts moving plot forward. New characters are fleshed out quite finely. As I was reading this arc I could finally tell that this is that great manga I was expecting. In first arc action wasn't anything special. You just got one nice conclusive picture but in this part Samura demonstrates how good action he can draw. And he gets even better with time.
Aftermath Arc - This serves as a little breather before things start to get complicated again. Samura portrays several characters and path which everyone takes. It's actually really good part of the story and it definitely isn't unnecessary. It's not really that different from previous arc.
Prison Arc - Here we go. Some say that this arc is perfection in its pure form and some say that this arc is incredibly boring and slow as hell. To be honest, I like this arc but I have to admit reading it chapter after chapter while waiting whole month(s) for another is really pain. But once you can read it as a whole it’s great. Samura shifts his storytelling into diary-like story flow. Nothing is rushed, author is taking his time to fully flesh out characters, plot, goal, point and meaning. Also a lot of set up for last arc is being done here.
War in wintertime - The last part. Every set up which was done is used here to its fullest. This story arc is gruesome, brutal, action-packed and fast yet pretty moving at times. Characters beliefs have their final clash here as they take weapons. The death is omnipresent. Great end for a great story.
To be honest, Mugen no Juunin isn’t perfect series. It has its flaws. Yeah, I never really liked Rin as a character. At start I disliked her, later on I just started to ignore her. Manji on the other hand is pretty fine character. The art is rough and simply great.