Been playing this and I see exactly why SJWs hate it. It has nothing to do with 'cultural appropriation,' that's just a red herring. This game not only depicts a classic paternalistic warrior culture, which the left already considers one of the worst things to ever have existed, but also romanticizes the ever living fuck out of it. This is a game where you go from chopping down Mongols left and right to writing haiku about the divine beauty of falling leaves while honoring your wise ancestors and praying at shrines. Jin Sakai isn't just a badass, he's deeply thoughtful and spiritual. His only moral quandary isn't whether to kill but whether to give his enemies a fighting chance against him. The violence being depicted is unquestionably justified. This is rarely done in media anymore. In all the Assassin's Creed games, there's the implicit assumption that your character is not a 'hero' or 'good' guy, so therefore is allowed to kill most anyone he feels like. Every Ubisoft Far Cry game is about the inherent amorality of violence and conflict. Elder Scrolls, nuFallout, and Dragon Age are all highly nihilistic, generally viewing no one as truly good. We aren't accustomed to seeing warrior heroes without a heavy layer of cynicism slathered on top of them.
KCD came kind of close with it's moral rulers and positive presentation of Christianity, but still often showed knights as either bullies or dunces while shying away from making the hero overtly religious. Paladins in fantasy literature have largely gone the same way, depicted as either naive fools or near-villainous zealots, far off from Three Hearts and Three Lions. The medieval romance has been a subject of mockery for centuries (re Cervantes) so it's almost impossible to find a depiction of knights and chivalry anymore that is anywhere close to idealized. The equivalent would be a game where you play as Roland swinging Durandal around chopping up muslims by the hundreds while piously praying to god and Jesus between every battle. Such a story would trigger every reviewer this side of the Atlantic.