Though it might also have to do with the conditions for learning espoused by Salen (who has since stepped away from Quest, but still sits on the Institute’s board).
If it does have to do with conditions, then how games are used for learning—and the context teachers place them in—might be just as important as the games themselves.
But make no mistake: game design is very important for learning.
Background: This paper considers one method of enhancing critical thinking through a problem-solving game called the Coffee Shop.
Problem-solving is a key component to critical thinking, and game-playing is one method of enhancing this through an interactive teaching method.