This is a good Shounen with excellent animation that incorporates camera movement in a 3d environment to create some really amazing action scenes (although the show is hand-drawn, not 3d animation). This is one of the best aspects of the show and one of the major reasons why it ranks so high. There is a lot of attention to detail that brings this story to life, from a character cringing their teeth to camera rotations and slight changes in color & art style to change the mood.
The other good aspect is the story & setting, with the story making an emphasis that although the demons live a criminal life, they are also victims themselves, but only a handful of characters actually sympathize with them. The way the story is told is meant for the viewer to be able to see both sides of the characters.
Unfortunately, midway through the story, the author decided that he wanted to be a comedian and introduced new characters that completely break the seriousness of the show and feel out of place with the mood of the show up to this point. The contrast between seriousness and comedy is even higher than in Hellsing, and the author uses cheap slapstick humor with no redeemable quality. At least for me, this is where this show goes down in rank and the "masterpiece" label no longer applies. I ended up skipping all of these failed comedy scenes, thankfully, you won't miss anything important if you fast-forward those parts, and the annoying characters are less prominent in future arcs (just fast-forward every time you see Zenitsu do a comedy act). Obviously, your enjoyment will depend on how much this makes you laugh, but for me, it was like watching a fly land on top of your favorite dessert!
At this point, the story breaks apart into serious & comedy characters with some episodes devoted to each of them. The fights continue to be great with action scenes but the tension gets broken by the comedy act. Somebody really needs to tell the author to focus on what he does best, do a separate comedy series if he really just wants to learn to do comedy, and just kill those damn characters on this series to save the rest of the story!
The sound effects & music are very good too and help convey the emotions as needed for the show.
Overall, this is a good Shounen show that in my opinion could have done way better without the humor that takes away the tension from the seriousness of the story, but it's not enough of a detriment for skipping this show. It is not perfect but has more good parts than bad. The animation alone might make the show worth watching.
"If I could sum it all up into a very short version, I can say with confidence that it's your shounen story done damn right. I'm aware that people before me have said this about KnY before, but I'm saying it to iterate that it's true.
Also, this is a story with much anticipated action in it, but at the same time, it does have its fair share of emotional moments as well. It's a story that will get you thrilled for the action scenes but a little heart-wrenching or teary in the emotional scenes. And the way they execute these more emotional or sensitive scenes were done well, in general and in my opinion." -kurishiri
"The actual story of Demon Slayer is a lot more. Tanjirou isn't just pressured by a singular large, overarching problem that everyone works together to defeat. Although the demons are the main enemy, Tanjirou also has to face problems such as his complicated situation after(most of) his family's murder (how Nezuko functions, and the morality of keeping a demon alive) and his fellow Demon Slayers, who have clashing views on his situation. The world is decently fleshed out..." -bigbeanboi
The dub is excellent!
DEMON SLAYER WATCHING GUIDE
Watch this whole season in full.
Movie vs. TV Series
The movie was basically broken down into episodes. Only the first episode is a new story and while some new scenes were added in all episodes, none of them affect the story itself in any way.
Also, in classic TV editing style, some episodes end in cliffhangers that just break the momentum of the fighting scenes. So in my opinion, having the fight cut just before the climax to then watch the outro song, outro bad-comedy segment, change to a new episode, skip or watch the recap to try to rebuild the momentum of the fight just to go into the intro song of the new episode; are just distractions that break the pacing of the story. Is much better to sit through the 2 hours of the movie and watch it without interrupting the pace.
If you want to know what the differences are you can read the following article, however, this obviously contains spoilers, as there is no way to talk about the differences any other way.
Note that they are of the opinion that the TV Series is better, I'm against this due to my reason stated above. I think the pacing for action scenes is more important than extra scenes of the train & passengers, extended bad-comedy and recaps, recaps.
Watch this whole season in full.
Skip. It's just more terrible comedy.