Our son, 9, loves this game, as do our neighbor's boys, ages 5,7, and 10. The graphics are relatively unsophisticated, but the kids don't seem to mind. Until my son's team made it to the World Series (and won it, of course) all other games were forgotten. We limit him to one hour of computer per day, and now that he's got the hang of it, he's able to play an entire game in that time. To us this is a huge plus -- less fuss when time's up. The game reinforces fundamental baseball rules and introduces some strategy.
This game is the most played game we own--in fact, my kids would rather play this game than watch TV. We started with the first Backyard Baseball and have owned every version released for both the PC and the Playstation 2. All three boys (ages 5,7 & 9) create their own fantasy teams (including creating themselves as players), play seasons, discuss strategy. They play alone and together. This game is worth every penny for playability and good clean fun.