Personal thoughts (does anybody actually read these?):
Arcanine-H
Looking at all these tier lists I was surprised at the number of people putting Arcanine-H in UU. I get that it's the same typing as Magcargo, but y'all are seriously underestimating how much damage it does. Seriously, nothing in UU can even hope to counter it defensively:
252+ Atk Choice Band Tera Rock Arcanine-Hisui Head Smash vs. 252 HP / 252+ Def Quagsire: 198-233 (50.2 - 59.1%) -- 78.5% chance to 2HKO after Leftovers recovery
That's about the bulkiest thing that naturally resists its STAB combo, and it completely shits all over it. Some things could maybe kinda check it if they burn their Tera (I.E. Tera Ground Max Defense Wo-Chien is "only" 3HKO'd by Head Smash), but these will crumple to Flare Blitz and don't have recovery anyway.
Now, you may be thinking that it's like Rampardos: Completely wrecks defense with ludicrously strong STAB moves, but is pitifully useless against anything that, like, clicks attacking moves. This isn't at all true for it. First of all, it gets Extreme Speed, so it has the option to go for Tera Normal Extreme Killer to shred offense, with even the option to slot Double-Edge for Tera'd STAB. It also gets recovery in Morning Sun and either won't wear itself down with its attacks with Rock Head or have a way easier time switching in with Intimidate. This, combined with the switches the threat of Tera Rock Head Smash forces, give it longevity despite its Stealth Rock weakness, which mitigates its weakness to revenge killing. Basically, it's Kind Of A Big Deal™ against both offense and defense. For this reason, I can't see it below UUBL. I can see it being an OU-proper wallbreaker, and even maybe overpowered in OU if we use the same logic we did with Annihilape in that it's kinda crap against offense but completely destroys stall and sometimes beats balance, but it is admittedly less effortlessly balance-destroying.
Edit: also Basculin is going to be banned from LC for the same reason but Wave Crash instead of Head Smash.
Sneasler
Ok, I get where the people who think this thing will be not-busted are coming from. Steels are good and it doesn't have ways to break past all of them at the same time. But seriously this thing is going to be HEINOUS to face in-battle. It's going to be the most Supremely Annoying Hax Mon since Jirachi. Poison Touch pivots will spread status everywhere for its teammates, Unburden Swords Dance is Hawlucha on crack and will pose a supreme late-game threat, and Choice Band can legit break past all the steels that bother it with CC and Night Slash leaving it free to spam Dire Claw. Your game plan against this thing is "hope you run into the favorable set and that you don't get haxxed to death", which is why I think it should and will be banned, not because it's necessarily OP but because it's really good and supremely uncompetitive
Samurott-H
This is going to be bad in OU, because the only niche it has is laying down spikes and dissuading Tusk to come spin on it on HO teams specifically. That's a good-enough niche, I guess, but the fact remains that it has all the other weaknesses of regular Samurott, being mediocre defensively, doesn't hit hard enough (especially as you basically have to run mixed in order to lay spikes while doing damage AND threaten Tusk, as Aqua Cutter doesn't even 2HKO physically defensive set lmao), and it's not fast enough, even with scarf, to outspeed stuff like Pult without full speed evs and a +speed nature which, again, really doesn't mesh well with its other things it's supposed to be doing. Basically, it's a jack-of-all-trades mon with a lot of potentially interesting niches, but can't do all of them at once and they aren't metagame defining enough to be worth the weaknesses of the mon
Kleavor
Potentially pretty good, except the Sizible Incisor exists and basically counters it, which is kinda of a bad thing when it's got 55% usage. That plus mid defensive typing, low speed even with scarf, having to pick its own checks and counters with 4MSS (Close Combat for steels + Gambit, Night Slash for Ghold, U-Turn for pivoting, Defog for shenanigans, X-Scissor for good Bug Stab, the mandatory Stone Axe, Swords Dance, the niche Quick Attack or Trailblaze to try and have a shot against faster teams) and the fact that even if it has the right coverage, it has to predict to use it effectively because of its frailty and speed issues mean that it is a very flawed pokemon that is supported mostly by Stone Axe, which you could just set up rocks normally without such a flawed pokemon with the only downside being that you don't do damage, which doesn't even matter that much when the best removal is 4x resistant to it. It will be great in UU, but not have a good niche in OU.
Edit 2: we definitely need a "disagree" reaction other than just laughing, which is condescending and doesn't always express disagreement