Though the story is great, there are some minus points in acting, some unnecessary scenes and unclear scenes that are there for nothing.
The characteristic and the story behind of movie characters are not well transmitted. There are some scenes showing that some of the characters do have relationship between them, but that story is kind of hidden to the viewers, making some scenes illogical.
The movie developments are super slow. The good point is that it has some kinds of connection to the next sequel.