This is not the best thing since sliced cheese!!
But it is pretty good. :>
That's the TLDR. xD
Animation- and music-wise, Ufotable once again blows everything out of the water with well-timed epic combination shots with dynamic 3d movement, and it's an absolute joy to watch.
And with that said, it's basically just a very long anime episode, with higher-than-usual budget.
I still don't care for Zenitsu and the boar-guy, the new character that's introduced starts off annoying but then is okay. The villains are fine, although their powers are a bit sporadic.
There are a lot of typical anime-moments I don't care for (such as the typical "watch out!"), but it is what it is.
It was fun, for watching a bunch of dudes fight atop a train for two hours while having flashbacks.