The thing I loved about the Metroid Prime games is the level of immersion they created!
All the goodness of Super Metroid but in 3D and with such a level of immersion... it really was, for me, the defining game of last generation! No other game came close to it, not even the immensely brilliant Res Evil 4!!!
With the controls of the Wii I can quite possibly see MP3C making it into my list of favourite games ever...
...right in at the number 1 spot!!!