The problem is, that even against regular players, people just leave when their team starts losing and the remaining players end up getting dominated at best, and spawn-camped at worst.
I've also noticed that server performance on this new mode is worse than BR or even Arenas. Hit registration is terrible. It's immensely frustrating that so much of the anniversary event is tied up in a game mode that is just so unpolished and not fun to play.
The game mode has potential, but I feel like it was undertested and suffers from the now-classic poor server performance on launch.