Kommo-o has been pretty inconsistent for me, I was using a Soundproof(for Toxtricity & other Kommo-os) Sweeper with Throat Spray and Clangorous Soulblaze, and Kommo-o is either a very very good wincon and defensive mon, checking Toxtricity and Aegislash. Or it is sac fodder. Sweeping Kommo-o needs a lot of chip and wearing down vs. the opponent, and it also is slower than the vast majority of scarfers, meaning that you need to always scout for scarfers on the opposing team, and remove them, before Kommo-o can do its job. Thankfully this thing has pretty good bulk and can live a lot of hits even when using fully offensive spreads.Kommo-o might be better in OU than we thought. Immunity to Shadow Ball is pretty insane, allows it to set up and switch into an Aegislash. DDance/Clang with EQ/Drain Punch/Poison Jab has been pretty nutty. Allows it to break every wall in the game. With Dynamax gone too doesn't need a mixed set to abuse Max Ooze either.
Kommo-o can really help your team with utility, its defensive potential, and sweeping/breaking power, and it also is definetely worth using, but this mon isn't very splasheable, and requires support from its teammates, much more than some popular picks like Dragapult or Corviknight do. Kommo-o also sucks in some matchups and make you wish like you were just using some other pokemon instead, so use it wisely.