From actually trying the game on the gamepad, i realise much of it is working as intended. The arrow keys and the other stuff to open the menu just are more natural than the mouse.
Which raises the issue of mouse users. Targetting is a nightmare and tabbing to select mobs just isn't working. Then there's the auto-lock feature in targetting which is just counter-intuitive to people comming from other well known mmorpg.
There's a mouse interface. It's there because if there wasn't you woudn't be able to use a mouse. I just think it could use some more polish. It's also the interface that 89% of PC users will naturally choose.
EDIT: What actually happens is if you're on top of the mob you can't click through yourself to target it and then you might die if the mob is aggro.
Or, you click the mob, run up to it then because you didn't click it twice before you can't click through yourself to engage the mob and you die if the mob is aggro.
Now that. Assuming you're new and you don't know about the target lock. You try to get off the mob to target/click it. But you die...
/EDIT