Art sucks at first, but it slowly gets better over time. It's hard to notice if you just keep reading, but if you skip tons of chapters and compare 1 to 50, or 50 to 100+, then you see that despite his lack of drawing talent, One's skill keeps getting better. I mean, it's not amazing looking like the officially serialized manga (which I just came from) or even the Anime (well, the first season anyways, the second one just had "okay" to "pretty good" art) but its good enough to get the story across, and the story itself is gripping.
Makes me realize that making a comic, no matter how bad of an artist you are, is probably a better bet to getting a successful series published rather than just pure writing, which anyone can theoretically do.