It was largely disappointing for me personally.
I was expecting more of a historic, gritty show, but this turned out to be something different.
The characters feel exaggerated in many ways, and the whole thing seems to be trying way to hard.
I agree with ShinShini in that it has an appropriate level of violence and the art style fits it well, but I just don't feel the same charm and deep vibes from this one, as golden kamuy and drifters.
Plus, they throw bunch of references at you right off first episode, bring up some folk tales (Momotarou, Urashima Tarou) and historic facts/figures (Yoshitsune and Benkei's battle), as if that would make this thing feel more Japanese.
But I would have appreciated more characters speaking older version of Japanese, than all of them sounding like they are from a shounen action anime.
Roughly, the settings of this era goes, the Mongols had been invading the Goryeo (Korea at the time) from 1231, at which time the Kamakura Shogunate (Japan at the time) maintained a friendly relationship with them, so they had a good idea of how things stood in the war against Mongols. Goryeo fell in 1270, and the Mongols started their invasion of Japan in 1274. There were obviously few inconsistencies when compared together, but I guess it's to be expected for the dramatic convenience.
The plot might be interesting though. I will continue watching for now.