As much as many don't like duncan, he is a good warden who does exactly what wardens should do or need to do at least in Ferelden when there are so few of them. Yeah, he is easy to dislike but he is doing what needs to be done as a warden. I don't really dislike him but I find the wardens on whole a dark opportunistic bunch. In DAA you become that conscripting people all over the place or taking anyone you can. Suddenly you are duncan and yet I'm sure most who dislike Duncan don't even realize that.
It looks prettier than it did in the openings because it appears you are saving Nate from himself or giving him another chance and it appears you are saving Anders from the templars and helping Sigund and Velanna, but you're just taking people to build your forces and look at who you are taking? Someone who might have tried to kill you and hates you for his father's crimes, someone who is essentially aiming to be an apostate, someone who has murdered countless innocents because of her hatred.... even a walking corpse who has some spirit possessing him. But that is who the wardens are, grabbing bodies wherever they can.
Yeah, I also made the connection. But unlike Duncan I never tricked anyone. I warned Oghren to think carefully, saying that there are risks. Anders, sigh, it was either being an warden or get hanged/tranquilized. What is the better option? Nathaniel, you can actually have him join by his own free will by letting him go from his cell, so there is that. I dislike being an warden,but also understand they exist for an important pourpose.
I wonder many times what would Duncan do, or any veteran warden for the matter, if they were in my place. I often think they would do things that Alistair highly disapproves of, such as preserving the Anvil, not bothering to go to the circle to help Connor, or recruiting Loghain.