If you couldn't find a good game for your Wii, then this game is the remedy.
The game takes place sometime after MP2. The Aurora Unit, a computer, has been frozen with a virus. And the Galactic Federation believes the Space Pirates are behind this. So they call world-famous bounty hunter Samus Aran and a couple of other bounty hunters to repair the Aurora Unit and repel the oncoming siege of Space Pirates. Now the gameplay doesn't change much from the other two Metroid Primes. But the controls in this game feel... right. That sounds weird, but the controls are excellent, and Retro Studios couldn't have improved on that spot any better. You'll never play first-person shooters the same way again if you play this game. Also, this game features upgrades from its predecessors ( like the X-Ray visor and Screw Attack) as well as new upgrades. One of them is called the "Command Visor". You can control Samus's gunship and cut down anyone stupid enough to stand in your way. You also have this new PED (Phazon Enhancement Device) thing, which allows you to control the Phazon corruption (hence the title). You yourself will be corrupted by this game when you play it.
All in all, Metroid Prime 3: Corruption is everything you'd want from a brand new Metroid game, and everything you'd want to bring the very successful Prime trilogy to a close. Also, I disagree with Gamespot. An 8.5?! Are you kidding me?! This game deserves more than an 8.5?! But, you know, they have their opinions, and I have my own. If you couldn't find a good game for your Wii, then this game is the remedy.