I'll begin this review by stating that I'm wildly biased in awarding it a perfect 10. However, I do recognize that there are various flaws that make this manga not for everyone. Despite these shortcomings I feel that the incredible impact the rest of the work has as a whole far outweighs and goes so far as to negate them.
Basara is an award winning classic for a reason. The story is compelling. The characters are multi faceted. The attention to side characters is astounding--so much that even characters we've known for one or two chapters can make an overwhelming impact both to the plot and emotionally. The themes explored are deep, heavy, and complex. They are also skillfully explored and executed in a way that moves the reader and makes a significant impact. Odious characters that were once abhorred are humanized; like the characters, readers come to assume a grudging respect for them, even mourning with them if misfortune befalls them. The author clearly highlights right and wrong, but paints a picture of a coin with two sides that also has a moral grey zone. The entire story highlights sacrifice, redemption, desperation, destitution, ruination, and the process of navigating, overcoming, and healing through these things.
And all of this has boldly withstood the test of time.
Basara is also for mature audiences. Although it already has the power to command readers' emotions, it requires a degree of empathy and understanding of the hardships of life and difficulty of navigating complex social problems. At times it rips back the skin of political, emotional, and ethical problems and rawly exposes the deep hurt that fuels the misunderstandings and perpetuates the issues at hand. Every time I re-read this work, I find I'm relating to it more and more. And seeing how the characters live out their lives in such trying times and situations is beyond motivating and inspiring.
I think the most life-changing aspect of Basara is that throughout all the deeply relatable themes it explores, it offers a solution of love and forgiveness. Not your typical shoujo style of obstinate friendship conquers all--love and forgiveness that is quietly settled on through grief, suffering, loss, and tenacity.
Say what you want about the art, the pacing, some unrealistic plot points, or even some of the characters. This manga is undeniably the heavyweight champion of epic stories that have the power to profoundly affect the reader.
tl;dr - This manga is absolutely incredible and I highly recommend it. It is for mature audiences though, and if you're not someone looking to get emotionally involved in the story and explore incredibly deep themes then it may drag on. It's not some romantic adventure--it's a heart wrenching life story. So if that's your cup of tea then please, buckle up and enjoy it.