Uh, how does that work?
Well if you picked the Seattle Mariners, first up to bat would be Ichiro Suzuki, and following behind him would be SpongeBob Squarepants. Stimpy's pitching.

Wait, Ren and Stimpy are in this game?!
Yeah! Plus Powdered Toast Man, characters from Invader Zim, and Avatar the Last Airbender. Plus, a bunch of current shows that are less exciting to anyone over the age of 15, but that your younger sibling/nephew/kid loves.

How do the motion controls work?
Exactly like you'd imagine. To pitch you make a throwing motion. The angle of your arm will determine which type of pitch you're throwing . Raising your arm straight up launches a fastball, while throwing diagonally sends a slider. Holding your arms like you're gripping a bat and then swinging is how you hit. The Wii controls work the same way, except you're swinging the Wii Remote like a bat. From my play time the motion controls worked pretty well, though getting the timing down for hitting took a few tries. The game can also be played with just your controller on the Xbox 360.

Is there multiplayer?
There is two player local multiplayer for every game mode, both with normal and motion controls.

This kind of sounds rad/dumb, how rad/dumb is it?
I think it's pretty neat, but I like the arcade style baseball games as a supplement to my realistic sports sims. Obviously this is for kids, so you'll likely need a small child to fully enjoy the product (not included with game). It's also the first baseball game on Kinect, and Kinect is in serious need of some sports titles.