Pretty mediocre DLC.
What could've been a fun bit with the moderately interesting premise of "Someone is trying to clone Handsome Jack" is a very short campaign with side quests that boil down to killing a type of monster, the which all ends with a terrible boss that, worse than heavily handicapping you for you not using a slim set of tools (*cough cough* Slag *cough cough*), is borderline undoable without and feels like it ignores the existence of one character and at least 1/3rd of the set of many others.
The Fall of Nakayama is fucking hilarious, don't get me wrong, but a 20 seconds bit and a chuckle is all it's got going.