Daniel Baker’s review published on Letterboxd:
The Long Halloween was one of the first Batman comics I ever read and still remains one of my favorites due to its striking art and focus on mystery and noir. Needless to say, I was skeptical going into the animated adaptation, especially after the disaster that was The Killing Joke film, but I was pleasantly surprised by how faithful it was. Splitting the film into two parts was definitely the right call as it doesn't need to rush the mystery into one film and has time for quieter moments. The only shame is that the art style of the comic wasn't carried over in favor of the new DC animated film art style that started with Superman: Man of Tomorrow (which is at least better than the previous style). Performances were generally pretty strong with Troy Baker's Joker being a highlight, at times it sounded almost indistinguishable from Mark Hamill. Jensen Ackles does a good job as Batman but sounded a bit forced at times. Overall this was a great adaptation and I'm excited for part 2.
FYI: There's a post-credits scene