New young generations of gamers need console to start with.
Its best choice for parents, people dont wont kids to be sitting and getting exaited about head shots in fps, they wont them to have fun. Add movments, wii fit, mario and u get perfect choice to start with.
Other then that are female gamers, my girlfriend loves wii, she dosnt care about HD, she gets from wii what what she remember as fun when she was playing snes.
Ps3 and 360 are mostly for older gamers, u wouldnt buy it for 10y old.