It seems that Nina's letting off some steam
I get the feeling from the film that Nina Paley is venting emotions about her breakup, along with her critique of the Ramayana. It's clear she finds some things about the Ramayana disturb her sensibilities.
The art in general is brilliant and unique. Though I did not like anything at all about the musical numbers, save perhaps the originality of their artistic usage.
While some fundamentalists might find this film offensive, they would do well to remember, it's just the expression of one persons own offense and bewilderment which was found in the Ramayana.
I think though, if Hindus be upset about the film, it's partly in that people may be taken in and enamored by the artistic quality thus (potentially) blindly accepting the 'thumbing the nose' at the Ramayana part, then disregarding any effort to try and understand the Ramayana beyond Nina's interpretation.
I'm all for ruthless yet constructive critical analysis of all religions. But this film mostly left me encountering the feelings of a bitter and scorned woman.
I wonder if Nina's husband went to India for a job but ended up leaving her for a religious group, which led her to do a cursory study of the Ramayana (as seen at the end of the film), and then on to vent her emotions by animating a parallel between it and her own experience.
I believe that for most of us, our own break up is the greatest breakup story ever.