The problem with this game mode actually has to deal with healing + 24 groups
Healers can't damage ice so they sit and wait for healing to be done, and good healers can heal though a burst 1 on 1. So it is hard to actually kill someone with healers waiting to heal people since they can't damage ice, unless you run into new people like my friend did once, let her die at the big ice while 2 healers spam dps on the big ice. There should be a benefit killing people so they can't hit the ice, but that only works in small groups. In 72 queues, it is just too many people to kill before the ice dies.