I still think this game could work really good with nunchuk wiimote.
You could jump with A, shoot with B, and keep pressing Z on the nunchuk would enable the 1st person mode without clunky turns of the wiimote, I hate that on Super Paper Mario so I'm pretty sure I'll also hate that in Metroid: OM
On top of that, you would have the analog stick to move samus, and not a d-pad.
It could be a better game control wise, I'm yet to see if I'm sold on this one.