Well i started playing with the controller and the interface was pretty easy, and i play all my pc games with the controller, but in this one i still prefer the keyboard and mouse, because of the liberty you have when involves Easiness of the combat, tough i agree that the strafe thing is better on the controller, the controller is limited to only 2 quick access powers, and with the keyboard and mouse you can configure up to 8. Since i'm a mage type and i depend a lot on my powers, i was feeling that the controller didn't suit my needs, and when i switched back to keyboard and mouse i became a lot more effective in combats.
So ye in this type of games i still prefer keyboard and mouse, tough i like the controller too.