Yep, the mouse trumps the gamepad 90% of the time, but for third person games that feature lockon as a main part of the gameplay, pads are actually better. Assassin's Creed is a good example. It's just better on a pad, and it took me a bit to actually realise that because I've used the mouse for so long.
That said, there's nothing wrong with lamenting the mouse controls in DS. They'd be good if they were coded properly.