Alright, I'll take the bait:
What is better with a controller? If you can name one thing you can do in the game that's easier with a controller than with mouse and keyboard, I'd already be impressed, cause I have found none. All but using your first 4 skills take more action from the player to perform on a controller. All of them.
DA:I is built around the controller.
The fast paced action lends itself to play with the controller. With the keyboard your keys are not spaced in easy reach as they are with the controller.
You can maybe reach one to four easily, but beyond that you are stretching. So maybe you need to rebind all your keys, and again this is not as easy as with the controller which is just pick up and play.
Secondly, you need to constantly be moving forward if you have a melee class. That means that one hand is on the mouse, and the other on WASD....and then maybe a pinky pressing the attack key all at the same time.
How this is easier than simply edging forward with the left thumbstick while rapidly tapping face buttons you'd need to explain to me.
Gameplay in DA:I right now is a lot more fluid with the controller.
The lack of auto attack, click to move, and the fact that you constantly need to reposition your character with WASD since the AI does move around a lot, makes it a clunky affair with a keyboard. And we have not even factored in the reflex based moves such as Parry or shield wall.