In the face of Galaxy 2's overwhelming dominance, it makes me happy to see Metroid Prime 3 putting up a good fight in the poll.
Glad I'm not the only one to appreciate its beauty.
Few games so effectively convey alien cultures through the design of their machinery and architecture, while even in the face of underpowered hardware Retro pushed the Wii's silicon valiantly, delivering loads of geometry and particles at a fluid 60fps.