I adored Aht Urhgan and its surrounding areas. The new jobs and how they fit in with the story is great. While it isn't my absolute favorite storyline in the game, it was still an emotionally impactful one thanks to Aphmau and Luzaf. It was the only expansion we were able to clear in less than a week. It is where we started to become frustrated by the frequent requirement to wait an in-game day to start the next story mission but it was not as egregious as the next two expansions.