What follows is a synopsis of the main story quests and what I think is going on in the mind of the big bad. This whole post is a reaction to what feels like an almost nonsensical final quest after the epic build-up, particularly “From the Ashes” (that armor!) and “The Final Piece” (that surprise reveal!).
Dragon Age: Inquisition culminates not in a boss fight but in the last gasp of a boss you’ve been fighting the whole game. You weaken him with every side quest, every new agent, every closed rift and new recruit. By the time you face him directly for the last time he’s but a shadow of the threat he was at Haven and you handily put him in his place. It’s nothing like the end of Origins but it shouldn’t be, not if you’ve done your job.