Regulation J won't move the meta all

Anyone else feel like adding mythicals really does nothing? Played about 50 games on the ladder to get into the ultraball and doesn't feel like anyone is actually using the mythicals at higher ranks. I've been trying (and struggling) to make Mew work, but it really just feels like its fodder compared to highest power restricted. Mew, Pecharunt, Hoopa, Arceus, etc. just kinda feel like a waste of a restricted slot when you could slot in Zamazenta, Lunala, or one of the horses and be much better off.