Best non-DLC mission in the game, with two glaring flaws. Really, one of the best quests in any Dragon Age game, with two glaring flaws.
What's good about it? It's a great display of intrigue, sneakiness, navigating the cutthroat social scene of the Orlesian nobility (which has been mentioned since the first game but never explored so thoroughly), and it uses the unique "Court Approval" stat in a way that acts as both a timer and a measure of how well you've managed to work your way into the court's good graces. Best of all, there's something like four vastly different ways for it to play out, all of which allow the player to decide who will rule one of the most powerful nations in the world.
The flaws? Well, for one thing the whole War of the Lions is barely present in the game despite being a hugely important part of it. If you want to understand who Gaspard is, who Briala is, and why everyone is fighting, you need to have read the tie-in fiction. There are quite a few elements of DAI that suffer from this problem.
The other flaw is much worse. Despite all the interesting mechanics and generally roleplaying-centered aspect of the quest, which endings are available to you depend entirely on how many stone halla figurines you've managed to find. This otherwise brilliant quest ... turns out, mechanically, to be a scavenger hunt. Not only that, but if you spend the statues on the wrong doors, you won't even have all the endings available to you. There's nothing in the quest to give the faintest hint that this is the case.
A wonderful, intriguing quest totally undercut by a numbfuck mechanic that never should have made it into the final product. In a way, it's a perfect cameo for Inquisition as a whole.