I must admit I don't usually like this kind of DLCs. They just take time from development away from the main story (which is the reason I play any game so, not usually a good choice) and they often deliver a subpar content that adds little to the mix outside some sex scenes with less interest since they don't fit with the choices or story events played so far.
But, so far, this has been the only exception to that. The story is fun, with all the rhymes and so on, and even the gameplay is actually better than the usual game, taking away choices but adding simple but fun puzzles to play with. It's also surprisingly long and the content quality is really high. So, all in all, I was skeptic about it but definitely have enjoyed this christmas DLC.