>>23378140
It's not that Big Battle is bad, it has good fights, the animation and direction is good, Niva was a neat antagonist and all that, it's just that it's a super minor action flick with little bearing on anything regarding the bigger picture.
Roots of Ambition and Last Red Shoulder for instance have a stronger connection to the main series, the cast has a strong emotional connection to Chirico and the overall story with Pailsen, there's none of that in Big Battle, it's "just" a good action flick with some really cool cuts.