Why target on the portrayal of Harley Quinn for its poor performance at the box office? The film was loved by the critics. It was the most acclaimed performance at the Suicide Squad movie, which prompted for the standalone movie.
The writer just did what he did. He knows the character well, and he surely liked the portrayal of Margot Robbie. There are factors why the movie didn't perform well at the box office, and I don't think the portrayal of Margot Robbie is the reason.
