Evreyone has their own opinion.
I can see why someone would dislike it,lets be honest,its definitely unique and so it brings on alot of opinions from those that were used to the more "common" art style.
The characters will seem weird to those who do not read/watch the show because they arent used to a giant fat cartoony snake woman etc
If a person cant stand the way the characters look he probably wont enjoy the show ingeneral.
Thats the main turn off for people it seems,alongside the slow start.