What's with all the negative scores? Is it someone who doesn't like the art style or something petty like that?

Apparently so.

It's less about style and more about the artist being bad at drawing.

Popebug said:
It's less about style and more about the artist being bad at drawing.

The artist is not bad at drawing. Notice Unzan's face and how the panels' composition always work. The artist has an exagerated, Oda inspired style. Under this style, he has no problems with drawing anything.