I think the developers or programmers (or whoever) forgot that the wii-mote has a directional pad on it, which is perfect for a baseball game. Every time I tried to throw the ball to a base, the player would throw home. Unless you are standing, or sitting, in the absolute perfect place (the sweet spot) in the center of the TV, the wii-mote is useless. When you finally find this sweet spot, the computer's AI is so good (even on the Easy setting) you will find it hard to play. I hit two balls that should have been home runs, but the computer managed to jump 15 feet in the air, after climbing a 10 foot wall, and catch them, both times.
There is also no auto-fielding so you have to run the player to the ball after a hit. It takes a few seconds to realize which way the ball is going, then you have to look around and see which random player the game has assigned to you. Then when you finally get the ball, you always throw it to home, anyway. Good luck trying to pull off any of the sweet moves the computer AI can. Supposedly you can jump for a ball (as the computer AI and the tutorial have demonstrated) but every time I tried it, my guy would slide at the ball feet first. I would always shout, "You're a fielder, not a base runner!" Very frustrating.
A friend and I tried playing multi-player, but that is just as impossible to play. Both players can't stand in the sweet spot, so one player's wii-mote will be useless during the play. We only played the game a total of 40 minutes, and that includes trying to get the game started in the first place (there was a scratch on the one we got and the Wii wouldn't load it).
Don't rent this. Wait for a better baseball game to come out.