It is dumbed down. Tactics is gone and replaced with button mashing. Any chance of actually making a wrong choice in the game is gone. Constant hand holding through the game. Only 8 abilities can be used. Baldur's Gate, for example, had 350 spells. DA:I lets you use 8.....
Well, in fairness, there were clusters of spells BG that did exactly the same thing. The whole mess that is DnD dispelling, for example (lesser dispel, dispel, greater dispel, disjunction, etc., then breach, greater breach etc. etc. pp.) got implemented almost 1:1. One, or perhaps two spells (cleanse or however you want to name it plus possibly breach) with scaling resistance/saving throws per caster class, would have done just fine. Plus, BG is no shining example of good storytelling, quite the opposite, in fact (IMO).
That said though, while I also would not use the words "dumbed down", DA:I certainly is a regression. I agree that tactics is a prime example; you cannot honestly claim that the functionality we used to have in DA:O and DA:KW was useless or overkill. Even if some people did not need tactics, it was a great feature that should never have been reduced to the sorry state it's in now. I'd rather not have any tactics and some better generic AI (i.e. don't stand in bad stuff, don't stand directly in front of the dragon, etc.) than a mere semblance of having an impact on how companions behave while not directly controlled.
The same applies to spells. It's ridiculous that I can no longer have versatile mages. I used to love having a spell for each occasion, now I have a checklist: 2 aoe, 1 primer, 1 fade skill, shield and a couple of spells of a different element. That's it. Poor. Very very poor.