A common complaint about previous Inquisition DLC was that it didn't add anything to the main story, that it had no consequence. Not so here, where consequences abound.
The Descent is a decent addition for players who are dying to get back into the game for a bit or prolong their experience, but ultimately casual players will want to skip it, or wait for holiday sales. The silver lining here is that executive producer Mark Darrah recently stated on Twitter that they "aren't done yet" with releasing story based DLC; hopefully we have plenty more to look forward to and Bioware can prove they really do listen to fans and what they really want out of the story.
Jaws of Hakkon is an enjoyable but unessential addition to Inquisition, great for players looking to prolong their game or for an excuse to dive back into Thedas. Those hoping for more content that directly influences the main story, or in-depth interactions with companions, however, may be disappointed.