The story is actually good-I'd rate the story alone a 7/10. It's a good arc, the characters stand on their own, and they behave more or less consistently based on how the story portrays them. The scene in which Miles finally gets into his own, that worked for me, a lot.

Now, how did I end up giving this one a 6, when the story is a 7? Because it's an animated movie, and to me the overall look matters even more then, more so than if it were live action. And the style-let's just say, I'd rather they went full hand-drawn or full, clean CGI (Pixar style). Still-frames look great, but movement-no.