The WOW community is too toxic for the younger gamers. I would imagine you are talking mostly 16-20 ish. That is a social age and they like the positive interaction. WOW is not welcoming at all to younger gamers or even new players. Some servers you log unto and the "community" consists of a bunch of players spamming chat with boosting ads.
Blizz redid the leveling for this x-pac and I convinced some people to give the game a shot as a group. Roughly 6-8 first time players. They loved the leveling and everything, then they hit end game and were like "WTF?" They didn't last long after that.
I think times have changed and if Blizz wants this game to return to success, they have a long way to go to make it more welcoming and less toxic. I know they say it is the players but it is mostly the design of their reward structure and the way they structure the end game. You can be challenging while not toxic, a ton of games pull it off.