Flementh wasn't easy and the electrical dragon in awakening either. Even on easy in dao you can't just charge in and rush them, only works on the dragon at the elven ruins in dao. But in da2 you can rush pretty much rush all the dragons, at most you may lose 1 party member. Atleast that's been the case with the 2 dragons I have faced so far.
But story is great and makes up for this.
The difficulty of Normal was drastically toned down. If you found Normal to be your ideal difficulty in DA:O PC, you should play on Hard or Nightmare. Friendly fire only seems to be enabled on Nightmare.
I played through on Nightmare and there were definitely some very challenging and long boss fights. I took me 20min+ to kill the end boss in Deep Roads and quite a few attempts since he could easily insta kill one of my squishies with some of his combos. I quite enjoyed this fight.
In general though it is a much easier game.