The FPS mode was disorienting. Almost without fail, I'd switch to it, only to be facing some random direction that ended up screwing me over.
Samus would always face the same direction in FPS mode that she was in 3rd person mode. I had a few problems with this at first. The issue is that the camera, and the direction Samus is facing doesn't usually match up. It is pretty easy to get engaged with something else on screen, point the Wii remote at the TV, and then realize you were facing a slightly different direction. Once I started paying more attention to Samus, I never had a problem with this.
NNID: theRepublic -- Steam ID: theRepublic
3DS - Currently Gaming Like It's 2011 - The Legend of Zelda: Ocarina of Time 3D
PC - Currently Gaming Like It's 2012 - Borderlands 2
Mobile - The Simpson's Tapped Out and Yugioh Duel Links