They kinda cooked with this arc, Huge step up damn
Art - 9.5/10 Animation is overall similar, but they use the effects? during the fights alot more, which just look amazing in the dark backdrop, I think the colour pallete is also a big help with how good it looks, alot of light blues, oranges and reds in order to make the animation shine in the dark night. (1 pretty bad CGI moment that if you have seen you will know what im talking about) worm.
Characters - 8/10 Zenitsu and Inosuke are still kind of annoying, but they are more serious characters this arc, Nezuko shines in the action and Tanjiro becomes a character I actually respect, great growth for only 7 episodes.
Story - 8/10 pretty cool concept of the train, never really see trains in anime and I think they are hella underrated, maybe I just like trains but they always add to the adventure.
Ost/Sound Design - 9/10 Holy soundtrack, during the fights the soundtrack goes crazyyyy, but the opening is weak which is why its a 9
Enjoyment - 8/10 Less annoying comments from Zenitsu and Inosuke and overall takes itself far more seriously, Huge upgrade.
Overall - 8/10 somehow this has a lower rating than season 1 and i dont know how thats crazy.