‘Proving Grounds’ are something I and many other World of Warcraft players have been requesting for a long, long time. I envisaged some sort of in-game tutorial or teaching tool designed especially for new players that wish to fulfil ‘important’ roles in groups, such as tanking.
New or inexperienced players would be able to learn the fundamental basics of their class and role without the pressure/stress of learning with a group of random – often impatient – players.