This is the first time I have played Dragon Age (except for a couple hours in the first one) and I am playing a DW Rogue on Nightmare, because I am nuts (and also, not coincidentally, a Dark Souls fan).
I have been all over the map when it comes to my Rogue. I was unhappy with my choice at first, because it just seemed like a glass cannon without the cannon, but after picking up a useful dagger that I could actually wield (another topic), I started feeling better about my choice.
THEN I had to fight Alexius, and man, that boss fight gave me absolute fits. I think part of the problem is that I still haven't quite figured out how to use Blackwell yet, which is also another topic, but my winning solution ended up being something like this:
1. Position Varric behind a pillar on the left.
2. Position Dorian behind a pillar on the right.
3. Pump Alexius full of lead (so to speak).
That strategy fell apart during the two Rift sequences, but that is where my Rogue really shined. He was a bit of a Gopher, which is not particularly heroic, but by using Evade and Stealth, he was able to wander the battlefield and help out in trouble spots where needed, including the occasional Revive. He was instrumental in taking out the Terror, which was making powder out of my ranged guys.
But then it went back to Alexius and it was *plink* *plink* with Ranged until I whittled him down. Whenever I tried to use my Rogue on him, I inevitably got pummeled with damage. I had a really hard time with the timing of the stealth, evade and damage. I'm not saying no one else could do it. I'm just sayin' I couldn't quite get the timing right, and with only 8 potions, Nightmare mode and a long battle, I didn't risk it after trying and failing several times before.
So I dunno ... outside of that boss battle, I am pretty happy with my DW Rogue, but in this particular fight, I didn't feel like he was a hero. More like a gifted intern. I am curious to see how the rest plays out. I'm sticking with him.