Is the best welcome to the Metroid series for a newcomer, and a wonderful ending for long time fans in the Prime series
Let's go in detail.
Metroid Prime is a subserie to the main storyline behind Metroid which, in turn, is a Science-Fiction adventure where you play the role of a Bounty Hunter who works with the good guys on a per contract agreement.
In the Prime series, Samus Aran, the bounty hunter, had found some planets corrupted with a strange substance called phazon, which actually have the power to mutate or even split the reality of an entire planet.
As the result of Samus fights in phazon polluted worlds, a negative being of herself is created which will chase her for the whole galaxy.
The Metroid games are heavily driven by it's story and each one has a lot of secrets to uncover. The Prime series, specially, contains most of the story hidden along the adventure and, succesfully creates an environment of desolation, isolation and tension ideal for exploration and adventure.
In MP3 you'll find a game which adds a new layer to the regular solitary adventure, as this time there are several other hunters working with you, as well as Fed Troopers. There are a lot more action than in prior installments, and it also contains appropiate references to previous titles, in order to set the mood for the newcomers.
Talking about the rest of the game attributes there are a lot to be said. It not only improves but show how a Wii game can look, as it sports, easily, the best graphics up to date in the platform, showing multitude of effects and renditions which aid to show such vivid lanscapes as well as isolated shipwrecks with such intensity and beauty, that you may pass more tome exploring just to see this worlds.
The music and sound efects are also great, and the game incorporates full voice acting to elaborate on the sci-fi movie feeling all the game accomplishes.
And for the controls. You may find yourself shooting like a wild gunnman before you note it, as well as dodging attacks and jumping along Samus more often than you think. The pointing features in the Wii-mote are put to ideal use, and some context driven actions make a good use of the motion-sensing capabilities as well.
If you're an experienced gamer, you may find the Veteran difficult setting more challenging, or even the Hyper mode only available when finishing the game for the first time. But if you want to get into the Metroid realms without too many frustrations, the Normal mode is your way to go.
There are tons of collectibles which can be used to buy the bonus material in the game, and much pieces of history and upgrades to make you go forth and back hundres of times, just to make sure that you've uncovered until the last secret in each area.
MP3:C, is an indispensable game in your collection, even if it's yours first Metroid!