Literally just beat the game, and I have to say, I'm somewhat unsure.
On one hand, it felt like the last mission could have been a bit better-designed and epic in terms of gameplay than it was (aesthetically, it was ****** awesome, I'll give it that without hesitation). But fighting Corypheus didn't quite feel as epic as it should have for the final boss. I was rather overleveled (Level 23, I think) so that may have been a contributing factor. Though, now that I think about it, final bosses in Bioware games (most bosses, when I really stop and think about it) have been somewhat underwhelming from a gameplay standpoint. I'm thinking of Saren's Reaper-skeleton (which just jumped around and occasionally eye-beamed me while I tried to shoot it with ME1's objectively awful shooting) and how Meredith would cause party-wide stunlocks for a few seconds of crazed monologuing (which could be bypassed almost totally if you were playing on anything lower than Hard and had the Rogue's Assassin specialization properly specced). I'm not even going to mention the waves-of-minions ***** that Kai Leng turned out to be.
So, I guess the final boss was more the Bioware standard; aesthetically awesome in all respects, but somewhat lacking in gameplay epic-ness for a major boss character.
Yet, that's a minor quibble compared to how RIGHT literally everything else about the ending was. There's a reason you don't have the Inquisition's army backing you up (within the timeline of the story, most of the forces are still in the Arbor Wilds. Cause, y'know, they didn't have an magic Elven mirror to teleport themselves back to Skyhold), all of your major choices throughout are acknowledged in the ending monologue and the chat with your party members in the victorious after-party (though I will admit, some things happened as a result of my choices and occasional lack of action (particularly when it came to choosing a Divine (I assumed I wouldn't have to tell Leliana that she shouldn't be Divine; I was wrong in that regard)) that I didn't expect to happen based upon what those choices seemed like they ought to lead to (the civil war in Orlais for one; it sounded like Celene, Briala, and Gespard did NOT find a way to really work together, even though I explicitly asked them under threat of skeleton-filled-closet-opening to cut the **** out and do that very thing, or the Wardens of the south potentially getting into a civil war with the rest of the Order because they decide to be more open about how they do things) yet things are still left mysterious and open enough even with all this resolution-set-up for future games to follow.
All I can say for sure is that I'm much more immediately and objectively content with this ending to a third game than I was with Mass Effect 3. I admit I didn't have as much problem with that as many did, but I was stil disappointed and confused on a couple levels when I beat ME3.
Not so with DAI. I had a blast the whole way through, and I've still got so many permutations of world states and Inquisitors to try out.