I really enjoyed Batman: Under The Red Hood and wished they had spent more time on the Death in the Family part of the film. Well Christmas came early this year because that happened.
Concept. The concept is pretty clever. This is a choose-your-own-adventure style story where the story branches off and you can choose what happens. What I like about this is it really explores several of the what ifs which is really fun and opens up new story possibilities.
Stories. The storytelling was really strong and really engaging. This story went in a lot of different directions, many of them ending very differently.
Corner Cutting. My biggest complaint is the filmmakers didn't go far enough. A lot of the footage was recycled from Batman: Under the Red Hood with the new footage at a much lower quality. Much of it was still frames or very limited animation with voice-over narration. While this wasn't necessarily bad and still provided a lot of entertainment, it was a sign of the whole approach to this. Many of the stories ended too soon not fully exploring the possibilities, and a few went in directions that were too similar instead of exploring a wider set of possibilities.
Additional Shorts. I like the characters they chose for the additional shorts, I just wish the filmmakers had chosen better stories to tell that weren't so dark and generic. I wish the stories better reflected the nature of the characters and what make them unique.
What I Would Like To Have Seen
I wish Warner Bros had put more money and resources into this project to fully realize it, because what they did do was really well done.