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Talking about the UB from a pure OU competitive stand point with exception of Pheromosa they're pretty underwhelming. Celesteela is annoying but doesn't offer any utility of other steel, such as skarmory and Ferrothorn. Celesteela main niche is how well it counter Greninja(Yes I max low kick can 2hko after rocks but no body runs that shit). Buzzwole is an overhyped shit mon that has a terrible 4 move slot syndrome. Guzzlord literally worst hydreigon. Like in everyone way. It doesn't even pull off a defensive set better since Hydreigon gets roost. Kartana seems broken on paper but the low base power of all it's moves and the prevalence of fat grass and steel in the meta hurt it's viability. I honestly wouldn't be surprised if Kartana eventually gets trapped in BL limbo like Staraptor. Nihilego pretty good. It has a solid speed tier, typing, and special bulk allow it to check top tier threats, like Charizard Y, Volcarona, Salamence, gyarados, etc. Xurkitree to slow to do anything and surprisingly easy to wall despite it's ginormous special atrack.
Tl;Dr: With the exception of Nihilego and Pheromosa the ultra beast are trash.
