Well, considering what led up to it, I don't see how I could like this story. They built up a mage/temp war in DA2 and Asunder.. and downplayed that in this game. Most of it was shuttered in the title screen itself.. lol. They're trying way too hard to NOT be DA2. It went from something moderately intriguing, complicated, and political to something outright childish. The story is a "Dark One taking over the world" type of thing we've all seen in a thousand cartoons and fairy tales and it pretty much overrides everything that came before. I was hoping there'd be some actual problem solving. And what little they can make sound interesting here fails too. The subtext dealing with faith (either yours or Corypheus') is lame.
Secondly, some of the things that are favorites here are just late additions. Like the Mythal/Well of Sorrows stuff was going to be in the DA2 expansion. Knowing that makes me resentful that DA2 never got finished.. And the elven stuff gets recycled here of all places. This game seems to want to address everything BUT the Inquisition or Chantry related things. The main story, the dlcs, the tacky extra races. And a protagonist with no solid context to any of it (except maybe one of them).
That said, it works as just some pretty adventure in their setting... but I wanted more. The whole pretext demanded more than another "adventure".
I admit I have never read anything BioWare and very likely never will, but anyway, you make a good point. Like the fact there was a lot of build-up in DAII about the mages and templars and DAI kind of wasted that. Hm, it's stupid of me I didn't realise that. It's true I very much treat it as a separate game set in the mess of the mage-templar war, just not about it. Just like DAII was a completely separate game from DAO for me. Which probably helps. I must say I was pretty sick of mages and templars after DAII myself. I finished DAII thinking, "All right. I see completely everybody's dumb. GOODBYE!" If DAI was about that again, it would probably feel like making DAII about another Blight instead of switching topic to me. But maybe if they handled it well, I'd survive.
I also admit I've been fascinated with Corypheus and what he did since DAII. When I played the Legacy DLC (And, yes, it's silly that they took the villain from a DLC not everybody might be familiar with.) and I started realising what he was, it was a (GASP) NO WAY moment. I mean, we hear about the magisters that brought the Blight since the first moments of the first game. The realisation I was about to meet one was priceless. I wanted to know so much more about what he actually did and what happened to him, what the hell he found in the beyond. I must say I was much more interested in that in DAI than mages vs templars yet again. So I didn't have much of a problem with Corypheus as a villain besides the fact there's some wasted potential there. We saw so awfully little of him and it's all about his lackeys.
Personally, I don't think we always need to have a villain that we have to sympathise with or that has to have complicated motivations. I mean, whatever concept you're going to pull out, it's been here a thousand times already. Corypheus as an ancient Tevinter megalomaniac trying to achieve what he failed to achieve so long ago worked for me. I don't see anything wrong with simple concepts. I'm up to whatever kind of story as long as I'm having fun. On the other hand, I understand that you don't like it. I know for many it is hardly satisfying.
I only learnt recently that the thing with Mythal was supposed to be part of DAII. That was pretty shocking for me, as well. That's not really DAI's fault though, but of whoever decided to rush DAII. Hell, I'd have liked to have some more meaningful content in DAII, as well. I used to hate that game with such passion because it all felt like a collection of random errands done in the same places for ten years when I tried to play for the first time. It took me years to make peace with that game. I sure wouldn't have been mad about more story-based content.
But, well, that's just me and my weird tastes. DAI is definitely a mixed bag and I might not feel the same about a lot, but I think what you've said makes sense. I can't argue that DAII didn't build ground for dealing with the mage-templar war or that Corypheus is a very simple villain. I see that this time I really lucked the hell out. Maybe it also helped I finished ME3 not long before starting my DA playthrough so I'm basically happy with whatever makes some sort of sense now, lol.