Class Halls aka Order Halls

Just what is this Class Hall we keep hearing about? Is it another garrison? Will it make the game a grind? Or will it be fun? Wowhead actually has a guide for it!! I am linking it here so you can read up on them to see just what you are getting into. 

http://www.wowhead.com/news=252294/how-the-legion-class-order-hall-campaign-works