Classcraft for Classroom Gamification

As a technology resource teacher, I receive daily e-mails that promote new products, programs, and systems for educational technology.  Since I hate clutter in my e-mail inbox, I usually quickly skim and delete what I don't foresee using.  I tend to keep most e-mails from Tech & Learning, which come daily.  Because of our recent unit on gamification in the classroom, this article about Classcraft caught my attention.

After briefly reading the article and browsing the website, I learned that "Classcraft is a free online educational role-playing game that teachers and students play together in the classroom." This section of the website explains more about the game and how to play it.  From my understanding, this seems loosely based on the ever-popular World of Warcraft.

While this is probably too advanced for me to use with my elementary students, I immediately thought of Charles Souza's Knowledge Quest game for middle schoolers.  I'd be interested to hear the opinions of any middle or high-school teachers- would your students be motivated by Classcraft?  Why, or why not?