Possibly the worst Joker story of the Modern Age.
This really set the Joker back to his "Death in the Family" days. Even worse; most comics that came outafter this contradict what this story claims the Joker was like or was possible of becoming. The Whole LotDK series is pretty iffy. Even the Wiki says that it's more canon to Batman Year One & not to current continuity, so it's almost like reading a long Elseworlds story that highly contradicts the Joker we know today. It's also fairly taboo to make references to specific origin stories, because all of them are supposed to be speculative & noncanon, & this book does planty of that.