YMMV / Good Manners

• Base-Breaking Character: Joel is either seen as a sympathetic kid who is understandably upset that he had been lied to about his origins, or an idiotic brat who somehow can't get the hint that he can't go out some nights because he turns into a raging bloodthirsty animal when the full moon is high.
• Creepy Cute: Is wolf-Joel a wild man-eating beast that had a thirst for blood ever since he was just born? Yes. Is he still inherently a puppy due to being a young werewolf, both as a baby and as a seven-year-old? Also yes.
• Squick: Clara breastfeeding a newborn Joel would've been cute... had Joel not been in his werewolf form and drinking blood from her tit instead.
• Unintentionally Sympathetic: While Clara can't be considered an unsympathetic character and our sympathies are meant to lie with her, the townspeople who get riled up into a frenzy at the end can't be seen as any less sympathetic for their reaction when looking at it from their point of view. For many years, they got to know Joel as a good neighbor but then they find out he's a werewolf who mauled one of their children and hurt another. To make things worse, Clara hid Joel's secret (even from him) for all those years, put Dona Amélia in a coma when she tried to get help, and tries to run away with Joel from the problems they helped create. Considering how Dona Amélia wanted to call the priest to exorcise Joel to help him and how Amanda was heavily implied to be against having a mob hunt Joel down, it was entirely possible that if Clara had been more forthright, especially by telling Dona Amélia and a priest about the situation, she could have possibly built up a network of people who would have genuinely tried to help Joel. But considering how Clara hid the situation for this long and Joel ended up seriously killing and hurting people, it becomes much easier to feel empathy for the townspeople for feeling absolutely enraged, betrayed, and lied to for this long, with the end result being that one of their children got brutally killed.
• What Do You Mean, It's Not for Kids?: It's a musical fantasy, and children become the main characters in the second act, it has to be for kids, right? Well, there's sex scenes, cheating, religious issues, gore, death, at least one Precision F-Strike, and it's clear our child werewolf character follows the more traditional mature and violent werewolf lore than other werewolf children characters in the past, who usually retain their sapience and/or act like domesticated puppies. In spite of all this, the official YouTube purchase gave it only a PG rating.