>>32137912Usage does not equal viability. Keldeo is UU but is considered a great Pokémon in this meta, actually a lot better than Buzzwole. And there is also Terrakion who is perfectly viable, not to mention the unreleased megas such as Heracross, Medicham and Lopunny that will for sure make a splash when they come out.
Fighting still isn't an awful typing, however to be good it needs to be on a fast Pokémon, or paired with a type that complements it well coverage wise, preferably both. Kommo-o is neither of those things and on top of that its best STAB is Focus Blast.