Ehm let's see.. Things I didn't like:
- Zenitsu was annoying at first, but he grows on you in time!
- The boar-guy is meh.
- I don't care for Nezuko's design throughout most of the series. What's up with that mouthpiece?
- I don't care for the hashiramas; they're too eccentric for my liking. Anime gotta anime, I suppose.
- Sometimes, there's a jarring disconnect between character motivations, the setting (which is both semi-modern and feudal somehow) and how demons are treated. Some treat it as a serious issue (and it seemingly is), but many don't seem to know of their existence at all, somehow.
That said, there is a lot to like! The story is simple, but it works; main character has a tragic past and goes out to avenge his family by slaying all the demons! But they tell it in an interesting way, with quickly-paced beautifully-animated montages, continuous action, cliffhangers and more!
I like how the main character, Tanjiro, both knows what needs to be done, but is also compassionate and a hard worker. He can be quite inspirational!
There's a few good laughs and a few odd moments, certainly scenes that could be scrapped or changed, but I think the total carry comes from the breathtaking visuals; whether it's the environment, cgi, choreography, general action, the designs, or all of the above! Also, the soundtrack generally fits the mood very well, and some themes are quite hype.
If there is something to learn from this, it's the following: praise Ufotable!
