For the past few days melee queue times have been a fraction of the time it is for range. At the time of this posting my Ninja had a < 5min queue wait but my Red Mage is sitting at 26mins. Yesterday my Ninja was at 10min and Red Mage was > 30min.
The MSQ roulette doesn't need a class balance like other dungeons, trials or raids. Just throw in whatever DPS have been waiting the longest.