As someone who has BioShock on their personal top ten games of all-time list and top three of 2013, I had to go back to play the DLC that marries the two worlds of Rapture and Columbia together. But is Burial at Sea capable of properly combining two memorable stories and two memorable settings into one cohesive whole or does Burial at Sea come off as nothing but BioShock fan service for the sake of nostalgia?