Played beta and still using gamepad. Have not had any issues at all. Maybe not 100% efficient as k+m. But it has not slowed me down in the least. So far I've done lots of instances with Conj + Glad. The more difficult for game pad I understand. As a tank, you can tab over to the next mob very easy with just the dpad left or right. It only stays for one attack then you focus back on your mob. Very efficient way of tabbing. And healing, change the way your character targets, and you only have to use up and down on the dpad. Again, lock on your tank with the A button (x ps3) and it will stay on him, and you can tab for a one time use just by using dpad up and down on any one else that happened to take damage. Ive had a blast with a controller and lots of people are quite impressed how this game works for it.
Also for a tank, I suggest you turn auto sheath off. So when your running in dungeons you press L3(left click) and you can draw your weapon. In your character configuration, you can change it so you only select enemies when this happens. Great way to do this, never have to deal with cycling of party.
This also works for healing as well. Just reverse it so you only target party members and not enemies.