The challenge was consistent but not challenging. Really, the scaling wasn't all that effective. In DAO I think there were about 2 fights that were risky - trap laying wolves if you hit them too early and the fight in Howe's foyer, but that one you really aren't supposed to win. The mob fights in DAO were markedly easier than mob fights in DAI because DAI you can actually screw up but the boss fights were harder in DAO. The encounter design in DA2 was so messed up it is hard to even discuss difficulty.
Crafting is clearly overpowered and I think anyone who plays more than once will learn that and, if they care, at least opt out of tier 3 for everyone. The other thing is crafting is that some of the masterworks additions are really overpowered options as well.
Ser Catherine, gaxkang, Jarvia , Branka and the high dragon. Not to forget the first ogre. Even every arcane horror made me **** in pants until Morrigan got Mana Clash ( one of big mistake in DAO). I do not believe everyone beat these all convincingly in their first game play. I still need a lot of planning to defeat High Dragon in DAO. That dreaded chomp.

. Why isnt dragon in DAI biting? I was right there mighty blowing her head.
Ware wolf fight? Can't remember. Did you side with elves and killed wolves?

. Blocked and reported for terrorism.
Edit. I went to orzammer before recruiting Wynne and i had nightmarea about broodmother.