Who will be using the classic controller and who will stick with the wiimote setup?
As much as I love the remote and nunchuck setup, it can get annoying because my sensor bar sometimes. And since I have a ps3 I'm already more used to the classicy setup. I will be fine with going back to the other setup if the classic one turns out to be lame, though.
I'll likely try both but stick with the wiimote. I just think its more satisfying to point at my friends and fire at them. It's more like an arcade game, and if you ask me, first person shooters are really what the wii is designed for.