There are obviously people in the world who are aware that the producer cast her daughter in one of the lead roles. And they don't like that. They're probably resentful that the producer can pay for such a glossy, beautiful-looking film; they're also probably resentful that Taylor Castro (as Mia) really can sing and write her own songs. Also, despite the hateful comments, Taylor has a fresh honesty about her performance; I doubt that any of the people criticizing this film would be able to do as well as she did.
Gail Soltys (who plays Lindsay, Mia's best friend) is a natural on screen and is extremely beautiful. She and Taylor came across as authentic friends and I totally bought their relationship.
I enjoyed the performances of both moms, Christy Carlson Romano as "Grace" and Jacy King as "Ellen." I'm not sure where the hate is coming from.
Yes, there were some weak moments, but overall, I found this film enjoyable and the performances solid. But I guess that people don't have a lot to do except to hate others. The thinly veiled hatred by people who apparently know the producer is obvious. Must hurt to live inside your jealousy all day, raging that someone else has a courage to make a movie instead of just sit behind a computer and tap out vicious critiques.