One of the best hardcore game on the Wii, with great controls.
Taken from the site :-
The Galactic Federation's Base Sector Zero is under attack by Space Pirates. Samus must boot up the generator to restore the defense systems. But at the end of her path, someone awful is waiting for her.
The war initiated by Dark Samus and the Space Pirates rages across many planets as they attempt to corrupt each with Phazon seeds. Players use the Wii Remote and Nunchuk to explore alien landscapes, hunt for weapons and information, and destroy the seeds. Saving the planets from Corruption isn't enough, though. Eventually, players must take down Samus' mortal enemy, Dark Samus.
Besides using the Wii Remote and Nunchuk controllers to pull off amazing feats like aiming and blasting in midair or at a full run, players also will have an array of different weapons at their disposal. In true Metroid fashion, these will become powered up as the game progresses. Not only that, but the controller will be used for a number of other game elements beyond the traditional firstperson shooter standards.
First-Person Perfect: Players control Samus by moving with the Nunchuk controller and aiming with the Wii Remote controller, allowing for a level of immersion unlike anything they have ever experienced. It's a quantum leap in first-person control.
Wonderful Weapons: Samus employs well-known power-ups like the Grapple Beam and Morph Ball, as well as new surprises, to help her survive. Using the Wii Remote and Nunchuk controllers, players will be able to grasp and pull things by using actual arm movements, as well as execute amazing feats like aiming and blasting in midair or at a full run.
Phazon's Powers: The game also incorporates a new system involving Phazon. If you fill Samus' Phazon supply to a certain level, Samus will temporarily go into hyper mode, a state in which she can pull off incredible feats. On the flip side, if she exceeds the maximum Phazon level, she'll perish. Also, for the first time in the Metroid series, Samus' ship will be used in active game play.