As far as characterization, the two leads are well written, and it is easy to root for them because the film does a good job making the audience care about them. However, the rest of the characters tend to have the same cliche characteristics found in a typical slice of life anime. These characters are not necessarily badly written, but I think they writers could have given them more depth and more meaningful screen time.
As a result I did not enjoy this movie as much as I wanted to. In hindsight I should not have expected a very mature story because it was done by an otaku studio, but Kyoto Animation has done in the past anime that feels more mature and realistic. Still, A Silent Voice is a good movie with lovely visuals, and I do want to collect it on BD; hopefully it is licensed for an R1 disc release.