Honestly at first I didn't like the idea, like many of the pony fans, I thought it looked allot like Monster High or Bratz. But after I analyzed it a little more and read up on the so called "bully" Sunset shimmer.
You find out that Sunset was a past student to Princess Celestia. On the back of the box that Sunset toy comes in, it says this "Sunset shimmer knows a magical path to a faraway adventures! Years ago she was a student of Princess Celestia."
So maybe this movie is less about a high school drama and more about Sunset shimmer's story and why she is in the human world.
Also don't you find it odd that
Its kind of a set up for them to be rivals know?
that's just my thoughts on it