I watched this with Mick after seeing it mentioned on a stuntmen channel I follow. It gets a lot of kudos for replicating 2D-animated combat with all the verve and speed of the original, and as so far as I've seen, it delivers. It's based off an anime that's part cartoon, part historical fiction, and it's pretty good. It's basically The Last Samurai from a different perspective.
The Last Samurai is about Tom Cruise's character just not liking America and getting away from it. Kenshin, in contrast, is about someone who loves his home country and struggles to find the best way to help it. Rurouni Kenshin translates to "the traveling samurai Kenshin", and is about a legendary swordsman learning to use his skill without the brutality he employed previously. It's not so much a rejection of war as it is an attempt to understand it, and to contemplate a world with less violence. It's pretty good.
If you're an anime fan - that means if you've liked Naruto or Attack on Titan or Death Note or whatever - then you'll like this film. If you liked The Last Samurai, you'll like this film. If you like historical fiction or cool sword fights or handsome Japanese actors, you'll like this film. It's rated R for blood, so heads up, but it's not gratuitous. It's good!