I don’t think that video games are the greatest learning tool that isn't been taught in school. If video games should be used in school to teach kids then they might tend to not want to learn any other way. They will refuse to listen or pay any attention to other ways of instruction.

I think it's not only attention. Videogames are funny but they a powerful tool. Playing to some kind of videogames students can solve difficoult problems and work in group in complex tasks. Any suggestion?

Not sure if it's the greatest but it surely seems like a big loss. Games in general seem to have captured the fun in learning (I like the theory game designer Ralph Koster has in his A Theory of Fun for Game Design, according to him what hooks people in games is actually learning).

Video games have much that we could take on board in teaching: immediate feedback systems, see-through way of following one's own development and compelling stories that bind the subjects together. If we leave out a teaching method because we fear it might become too much fun I'm afraid we might be a bit counterproductive. The purpose of schools is learning, what ever way kids want to learn should be the right way as long as it isn't harming anyone. If it's proven to work, why would we not want a more fun way to teach and learn?

There is another relevant concept here: gamification of tasks. It's not the same as play videogames but it has the same origin.