The drawing is technically very good. In fact, everything from the characters, backgrounds, tones, etc., are accurately depicted and very well-constructed. In fact, I feel that the scenery is rather gorgeous and same for certain depictions of certain characters. However, at times, I feel like the art has sacrificed the ability to emote in favour of technicality.
The story is intriguing. I'm sure I've read a simpler version before but never has it been told and etched out in such detail. The conflicts, the various motives and lives of the entire cast is depicted and written with care. And the historical settings are very well-done, from the buildings to the food, to the clothings and behaviours of the people. (In fact, the story feels very historically realistic as opposed to an interpretation from a 21st century viewpoint.) And the action scenes are fairly cool too as even the varying sword techniques are depicted accurately and interestingly in terms of art and writing.
However, such an in-depth, panel-intensive approach to storytelling is not without risks when considering the immense cast involved as the series is what? Probably halfway through the total intended story arcs. This is further complicated by the philosophical aspects. Though interesting as they lend an introspective layer to this series, the author seems bent on repeating them so it adds on even more pages to an already lengthy saga.
And to me, the final blow is that by focusing too much on action and bloodshed at times, the writer has diminished the characterisation of Musashi by making him seem too murderous when he fights for other purposes. Yes, I understand the need to depict the blood-thirsty era of the samurai ages but without constant narration or other forms of storytelling techniques, it's hard to seriously and properly maintain the layers of his character or of the other cast. In contrast, I feel that Cesare, Historie and Vinland Saga do a much better job of preserving characterisation while depicting a story amidst blood-drenched histories. That is: showing the characters to be capable of extreme violence while not allowing the bloodthirst to overshadow the storytelling.