Don Norman wrote a very good essay on Games and Education.

Children, we are told, have short attention spans, caused, of course, by the prevalence of games and TV and commercials in our society.

Nonsense.

Watch people at video games. You can't tear them away. More importantly, they truly are exercising their minds. They problem-solve. They take notes, read books of hints and strategy. They save the game state, try out a new course of action, and if it doesn't work, return to the saved game state. And they form social communities, sharing hints, tips, and methods