I totally love playing prime with the motion controls vs the controller. It's just better.
Switching beams and visors is ass with Wii controls. Literally ass. On the Cube it's quick and seamless and totally sexy. I didn't even use free aim much on my Trilogy Echoes run, I actually turned Lock-On Free aim off entirely because it was useless. I think most of my recent dislike of Echoes comes from Wii controls being unbearable.