I kid you not, ANDERS is the one who brings up the Mage thing.
Tallis just ignores him.
Anders: "Do you approve of mages having their lips sewn shut?"
Tallis: "Right now? Yes."
I was like, "I knew a Qunari had that happen to him and **** you for making fun of him, Tallis."
You'd appreciate this then. Usually, when I'd do the DLC, I wait until Act 3. What can I say, I love being called Champion. Anyhow, I did it right after I helped Anders collect the materials in Act 3. Imagine my surprise when one of two people in the party that never ever shut up about mages and templars had zero to say to Tallis. This is supposed to be Anders/Vengeance at his breaking point, and he has nothing to say to her. 
I'm not calling Tallis a Mary Sue, since I think it's an overused term. I don't hate Felicia Day either. She isn't my taste as an actress, but I think she's alright. I am saying that either due to oversight, time, word budget or a combination of the three, it came across like Tallis was in the right no matter how you might have felt as a player. In a game were the concepts of mage freedoms versus templar order was the focal point of the story, that DLC really fell short. It made it feel even more disconnected with the main story.
I actually liked Tallis overall as a character up to that point, but my lack of agency as a player when it came to the role of mages in the Qun just took me out of the experience. I still can't say I hate Tallis, more like I hate how that whole conversation in the prison about the Qun (and when the topic came up again in the cave,) was handled.