Honestly I thought this would be something interesting but as more and more new chapters came out I started to have less and less hope for it.

My biggest issue was the pacing, it has long drawn out fight scenes and flashbacks but the story moments which should be long and properly articulated are pushed to the sidelines to fight yet another generic villain. Another issue I had was how formulaic it was, the whole series was just this on repeat:

New demon shows up
Tanjiro meets a new Demon Slayer
Tanjiro and the others almost lose
Flashback detailing some character's past life which doesn't seem like it fits with their current personality
Demons almost win
Short internal monologue while Tanjiro is on the verge of death
Tanjiro gets OP
Short "arc" that establishes a couple characters

...and it never really deviates from the formula.

and besides that, the characters are archetypes with little to no interesting traits, the only character that's even slightly praiseworthy is Tanjiro, his motivation was good and his character definitely seemed natural, but although he had all that going for him he acted like a generic shonen protagonist akin to Deku from Boku No Hero Academia.

And before you call me a hater or something, let me list a few things I did like:
-The character designs (appearance wise)
-The first arc
-The distinct art style (It was cluttered at times though...)

TL;DR: Painfully generic and nothing special. but a decent shonen to waste a couple days on nonetheless.