This is a exaggeration of the first movie success. It's just a far streched drama movie..where the first half i.e. almost 1 hour of teenage drama..and miles coming off age...the family issues etc.
No story buildup. I couldn't sit through the first half it was almost torture. Just because it's amazing animation and great to look at does not mean it's okay to lack story. Do not go to watch with expectations from the first part. Only go and watch it you just wana appreciate art and design. The entire action is in the second half of the film.