Ok I really don't get this "Teagan is a douche" sentiment floating around. This man lived through the Orlesian occupation, his father died at the battle of Westhill. Now this nascent military-espionage organization, founded by members of the Orlesian Chantry, full of Orlesian soldiers, has a fortified presence on the Fereldan-Orlais border and in Crestwood. Not only that, the Orlesians want to control this organization. Get real that **** is scary to any Fereldan with a brain. Did people really think that Teagan (or any Fereldan representative for that matter) would not be aggressively advocating for the disbanding of our Inquisition?
As for his comment about the Wardens. The Wardens didn't save Fereldan Alistair and the HoF did. They were greenhorns, all they know about the order was "kill darkspawn, end blights, whatever it takes." They aren't representatives of the order as a whole and treating them as such is dishonest. So when Teagan refers to the exiling of the Wardens for starting a coup he's not being an ungrateful dick, he's making a valid analogy between two large foreign organizations.