Story - 7

Standard shounen type story.
Interesting power/magic system.
Pacing is fast and jam packed. (it's like sprinting in a marathon match)
Have linear storytelling. (only give us a breather right before the last arc)

Art - 7

Kinda good and artistic, but pale in comparison to its anime in every aspect.(currently, the only series i like watching the anime more than reading the manga)

Character - 7

Great characters design.
Good portrayal of empathy from main character.
Lack of character development (flashback is not character development, it's a tool to aid character development) make me couldn't care less about characters death. (good guys or bad guys)

Enjoyment - 7

Each chapter, I always though the current chapter could be better and the next chapter would be better. (but nope, its a 7 from start to finish)
Really really disappointing ending. (it's more of a fan-service than a proper ending)
I really hate when a character get resurrected, while its resurrection contribute nothing to overall story.

Overall - 7

For me, pacing is really the issue in this series. While no chapter feel like a filler, it's really damaging immersion, character development and world building it has.
All in all, Kimetsu no Yaiba is a good Shounen Manga but nothing groundbreaking or praiseworthy.