Visor changing is a real pain in Wiimote-MP1. I haven't gotten past it so I can't compare it to the game that was fucking made for Wiimote controls.
Again, note that part, please.
MP1 was literally, specifically, and very very clearly built around pad controls. The entire game was made with the express purpose of proving that pad controls could work in an FPS. So yeah, taking out pad controls is, in the first place, a lot like taking the giant goddamned console out of Steel Battalion, and secondly it just doesn't work very well because shit wasn't meant to be played that way. It becomes very goddam clear when you face the very first boss outside of the tutorial and can't hit shit because it's literally just several waves of small zippy things that circle around you, and it turns out that "point at a vaguely defined invisible area at the edge of the screen to turn" is a lot less intuitive than "press a direction to turn in that direction" when you're trying to find things that aren't all up your face.
Which is not to say that the Wiimote controls are "bad" or "inferior" - I rather enjoy the fuck out of them, especially when you're up against (big, slow) space pirates. Which I understand is mostly what you're up against in MP3. But yeah, when someone who hasn't even played the first game the way it was designed jumps up and rabidly defends "his" way of doing things because somebody pointed out that it doesn't really 100% work in a janky retrofit, I have to glance up at the URL bar and make sure I haven't accidentally typed in GameFAQs.
And of course, Nintendo not putting in the option is so, so stupid. I'm guessing they really just imported the first two games' data into the MP3 engine and were too lazy to re-implement GC controls, but Jesus have some fucking pride in your historic accomplishments in the field of giving FPSes consolitis forever.