The biggest issue (as in difficulty) was in DAO, I think, the fact that you actually had to select the role of each member in the tactics screen. When you gained new abilities or skills it didn't automatically update the tactics. (you had to reselect the role or customize it yourself) Since a lot of people probably missed that (I know I forgot quite a few times to add new useful abilities to the tactics), it naturally was a lot harder to keep up with the game difficulty, even at normal.
If you had the tactics up-to-date, it became a lót easier (of course).
Since the tactics were automatically updated (and assigned when a new character entered your group), I would guess that is also the case with inquisition, so in that way the game will probably be easier than DAO.
The difficulty settings in DA2 were a bit annoying though, as in, they have more health/dmg and instead of 2 waves, 5 waves will spawn, making the fights feel drawn out too much, in my opinion. I hope it will be more tactic-wise difficult in DAI, as in, they have better assigned tactics or use their abilities in better synchronisation.