My favorite part of the article in Forbes online is this:
The majority of games fail because they attempt to teach skills rather than thinking. They focus on retention rather than understanding. They miss the whole reason we should be excited about game based learning in the first place: because it offers the potential to change the common way we approach teaching and learning.
Sometimes as teachers we are guilty of that same problem-- teaching skills rather than thinking; retention rather than understanding. I challenge you to look at your current standards. How many of them are you teaching with drill and kill tactics and how many of them do you teach by making real world connections? I know that by making connections retention level is increased! I would bet that these students playing this games are getting better because they are increasing the connections they make with problems, numbers, and math concepts in general. Have you seen games used to help students make connections with topics?