I really liked the subtle implications in the movie. Most people who watched it missed some of the important lessons because there was no "Dear Princess Celestia" moment.
For example, I've heard complaints about the scene where they became friends again because it happened too fast and out-of-the-blue. However, I liked that scene because it showed a major difference between our world and Equestria. We do so much online and rely so heavily on e-mail and social networks to keep up with our "friends," but in a way we've sorta garbled what it truly means to be a friend. I thought the scene represented the honesty of in-person communication and I was pleased by how quickly the characters accepted each other. Those who were upset probably didn't understand that true friendship is about both parties being honest to and trusting of each other. It's truly a special thing that exists in Equestria, but is missing from our present lives.
I also liked that Rainbow Dash wasn't a jerk for once.