I admit I am a Nintendo fangirl, but I know a fun, easy to pick up, and downright amazing game when I see it.
Story: Princess Peach has been kidnapped yet again (surprise, surprise) by a "planet sized" Bowser (well, Nintendo tried to be a bit original.)
Controls: You play with the wiimote/nunchuk combination, and I've yet to encounter a problem. Press a to jump, b to shoot star bits, move Mario with the nunchuk. Yoshi is also controled with the nunchuk and you press b to have him eat things.
Graphics: For a wii game, this is outstanding. The colorful, cartoon-ish graphics are a Mario staple, and they are pulled off quite well here.
Gameplay: The whole gimick of the galaxy games is that gravity plays a roll in the game. Every planet has different gravity to keep the levels interesting. Also, there are powerups Mario uses throughout the levels (staples like the fireflower, bee suit, and new power ups such as cloud Mario). Yoshi also has powerups to use, but most were only used once, 3 times at the most.
Nostalgia: This game has 2 levels which hark back to the past 2 main games in the Mario series; Mario 64 and Super Mario Sunshine. I don't know about you, but when I heard the redone bob-omb battlefield music, I smiled.
Note for parents: There is a 'cosmic guide' feature in the game. If your child continually fails the level, the cosmic guide will take over, showing how to get through the level, and the giving the player a bronze star. I haven't used it yet, but I'm only at 96 stars out of the 242.
The game's current price at 50$ is a bit steep, but the game is fantastic.