Played through Harley Quinn's Revenge over the weekend. It was fairly short and you should be able to beat it in a few hours. I really enjoyed playing as Robin, and it would be nice if you could play as him in the open world. Anyways, I have gone back to the main game and I am trying to take care of the Riddler trophies. Now that I have all of the gadgets, it isn't as bad, just time consuming. Also, it is nice being able to interrogate some of Joker's men that give away all of the locations in an area.
However, the Advanced AR challenges can suck a cock.