I've played the last 4 beta tests and it's always bothered me. This time around though it just blows my mind that given the way the interface is designed that there is no out of the box controller support. When you add to that the fact that the game is being released on PS4 and Xbox One, there's just no excuse.
The hitboxes are large enough to compensate for any aiming deficiencies because the combat doesn't require precise aiming. It does require twitch reactions though and those are best suited to a controller, specially in third person.
I'm to the point where I'm leaning towards playing on PS4 despite having multiple friends who are all playing on PC. One of my friends said he used Xpadder and is able to use a controller. The point is that 3rd party programs shouldn't be necessary in a multiplatform release with a UI designed around controller use.