@irontoenail - I would say that's true for adults as well. I've never had as much fun or learned as much about my friends as when we took a drama class together and most of that was playing games.
In fact, I'd say the most important things kids and adults learn from playing games together is how to win and how to lose without annoying the people around you. Co-operation is something that is best taught in that kind of environment as well, particularly when kids are young and can't really do complex assignments together. Educational kids games don't need to be stuffy. They can learn from a game of tag.