The art isn't that bad! All it matters is a good story with good characters and development. You won't regret it because its good. I personally love this manga and the art!
You think you can draw better than the author fucking bitch?! Don't even read it then if you hate the art. Always hearing people complained about the art style when they can't even draw for shit is fucking annoying. Don't even appreciated how much work is going towards into drawing.
To be honest i too had some difficulties reading the manga with that kind of art style because i was used to reading manga with amazing illustrating skills, but seeing how Hajime isayama became well known even though he has low skills in drawing is quite amazing, and seeing ONE having 2 of his mangas being able to have an anime adaptation is quite unbeleivable for some because of his drawing skills. Actually ONE really didn't intend to be a mangaka but suddenly he became one, lol. I'm not gonna rage on you for not liking this manga cuz i experience that too, but if you keep reading it you'll get used to it and realize how amazing ONE is. Being a mangaka is quite hard you know ;;v;;
If a manga was just more on looks and how it's presented without a good story behind it doesn't mean shit, whereas if a manga that doesn't have the drawing quality but with a damn good plot/story (a.k.a makai no ossan, one punch man, mob psycho 100), I would gladly choose a manga with a damn good story, than a manga that has a good art style.
Heaven help me! I just finished watching the Anime, I'm in love with MP100, sadly it's only 12 episodes so I need to read the manga to see how the story continues.....but....I....can't....take.....the art style. I can't read the manga!! whhyyyyy!!