I think that is actually a totally fair way to look at the show. The moral implications of Kotaro's actions are immense and dark. Also, the way he more or less threatens them with society's reaction to zombies in order to become idols is extremely manipulative. I can totally understand why those aspects of the show would turn somebody off from watching.
For me, I have been enjoying the show after basically accepting those bits as the needed bits to establish the premise and then moving on. Namely, the premise of a group of zombie girls becoming idols. After the first couple episodes, they aren't really brought up any more and the girls are all acting of their own will. They are even capable of doing the makeup on their own without Kotaro by the time you reach season 2.