They are somewhat viable, but currently they suffer from the fact that the metagame is simply too fast and furious to let you set up trick room, plus it's very easy to stall out the four (three if you have to swap out your setter) turns you get with trick room, giving you two or less turns for the effort required. They CAN work, but the level of effort you have to put in to make them work compared to the big 5 (Sand, Sun, Rain, Hyper Offense, Baton Pass) simply is not worth it.
Jirachi and Bronzong are pretty much going to be your best setters. Make sure your abusers aren't weak to common priority and are decently tanky with attack stats high enough to be worthwhile. Put in a lot of effort. Feel good about your creative and not-cookie cutter team. And then cry because the big 5 demolish you by randomly mashing buttons.