Solo queue on Blackrock is a great feature but when someone that has never played the game or the typical troll destroys the fun for others it's a problem.
One really easy solution for this is to have a rating requirement in 2vs2 or 3vs3 to join solo queue. A small requirement like 1550 rating is enough to counter this problem, it will also make those people that can't join solo a need to interact with another person to create a 2vs2 team. Playing 2vs2 is also a lot easier to start with when new to wotlk and learning thier class.