I like it, i don´t love it though, at least not anymore. Up to coalition arc, i would have easily put this among top 10 on my list, but after that it becomes too repetitive with antagonists you can easily switch out for the most part without having major influence on the trajectory of the narrative, which is one of the key points i would not put it up there. The Ryofui confrontation arc was another highlight after coalition arc, and while its quality partly stems from what actually happened, it´s also no coincidence i feel like that considering Ryofui is one of the two most memorable antagonists of the series (besides Riboku). Plus Shin, essentially being a Shonen protagonist, feels out of place in the manga for me. Might also be that i have an unusual perspective though since i have seen a few different dramatizations of the Warring States Period and other significant eras (whether it´s movie or dramas) in which the essential characters of the era were built up simultaneously instead of introducing them in succession. But considering we still have a lot of story to tell, and considering we have many characters from each kingdom already introduced now, my perspective might change.
I put coalition arc as top 5 arcs i have read though, there was not one moment i felt was wasted.