Reflective games aren't a waste of a time (that allows you think and reflect on a situation thereby improving the way you learn things) but games that put you on an expert(or relax)-mode definitely are a waste of time--imho. I mean this is true when talking about games but probably in true in other situations e.g. you wouldn't like a Pilot who wants to reflect on a situation when plane and 400 passengers are in danger (taken from a Psychology book whose name I cannot recall) :)