This is overall a very disappointing game mode. It isn't balanced in the slightest, and the majority of the community suffer playing it. It seems as if it was only made for pre-made teams of professional players to have a hard time with. Even when playing with a high level team who all know exactly what to do, we get steamrolled constantly. And this is just on Normal. I've finally got far enough in the Trials of the Gnomus to need 150 rainbow stars for the two chests. And the game mode had to be nearly impossible. Assuming 3 rainbow stars is the maximum reward... (because winning is far beyond reliable). I've gotta grind out 50+ games. They need to make it significantly easier just to get half of the playerbase to have a chance at winning.
It's not fun, it's not fair, it's grindy, broken, and a total mess. Even people who'd find it easy admit it's nearly impossible to find a team of random 3 players to win with.