Do not be fooled! Now, let me clear first. I am not saying this show is bad. It is just so overrated to the point that it hurts!
No offence to the people who like this show. I respect everyone's opinion and I am only sharing mine. Moving on... I found this anime too childish for me. No mature drama, Typical shounen plot, generic characters and villains. It simply didn't offer anything groundbreaking to the table.
Yes, it having a 8.8 rating is just too much to bear. Why? Because, it makes it seem more good or equivalent to the true anime wonders: Samurai Champloo (8.5), Neon Genesis Evangelion (8.5), Steins;Gate (8.8), Code Geass (8.6), The Promised Neverland (8.8) and many more. But is it in par with these anime or even better? Hell no! It doesn't even come close to these shows. If you are a fan of shounen, I would highly recommend you to watch My Hero Academia. Now that is a shounen worth-watching. But it only has a rating of 8.5 while Demon Slayer sits on 8.8, which, in my opinion, doesn't make any sense and is so unfair and misguiding.
Of course, the show has good points like the soundtracks - which are really good, and its animation. But hey, you can't rate a show so high just because of that.
Furthermore, many people talk about Ep. 19 - which has a 9.9 rating. Let me break it down to you, it wasn't anything special as well. I admit, the one scene in it was animated way too beautifully that it got be shook - but that's just it! Nothing else. The whole episode was a fight scene that too was a generic one.
Why I am writing this review is because I just finished Vinland Saga (a pure masterpiece) and started watching demon slayer, thinking it would be yet another show after Vinland that would make me go crazy but alas, all I found was mainstream shounen content with no emotion invoking depth. I was really disappointed.
So, I would conclude that the rating of this show can very much deceive you. Do not let it! If you are in mood for pure shounen stuff with great music and animation, you can watch this show. But if you are in search for a masterpiece (or even less than that - like a pretty damn good show), keep searching and just skip this show! You wouldn't regret it.