Of the 20 games I have owned, WCS is by far the most popular with kids. I coach hockey and baseball so I have had the pleasure of hosting many many teams of young players between the ages of 6 - 15 and that is pretty much across the board despite the age. They seem to like the simplicity of the game-play and scoring goals.
Even my friends (non-players) still miss my WCS. Fortunately, I still get to play it sometimes because I sold it to a friend who is a big football (errr ... soccer) fan.