Thoughts on some of the most notable mons from the new meta
Quickban worthy:

I will admit that I vastly underestimated this pokemon. 120 base attacking stats and 99 speed seemed underwhelming, especially with the lack of boosting options outside of speed. But the bug is easily the #1 poke in OU right now, and should be on every team. With scarf/band/specs + proper download boost and coverage move, this mon can outspeed and one hit KO anything in OU. That may be a bit of an exaggeration, and specs isn't a great set compared to the other options, but the fact is has the potential is disgusting. And since every set and every coverage move it can carry is equally viable, you basically have to scout the bugs entire moveset before you can confidently wall it. For sure broken, send it to Ubers.

I would argue this is the #2 ladder poke rn. Gross power, only really needs Earth Power, Sludge wave, and focus blast to be good. Auxiliary slot for sub or something. With rock slide only wallable by latis. Has knock off and 125 base attack for latis anyways. Can pull many of the defensive tricks lando-t can having two immunities, decent bulk, and useful resists. Basically, run ice beam on your scarfers and avoid fat teams until this is banned lol. Picks walls apart.

Tbh this is kind of lando on steroids. Almost as powerful, its three move coverage is basically perfect, has incredible speed and a much better boosting move. And since the power doesn't come from the ability naga gets to use its ability to boost speed. In reality this is more often checked since heatran is so good atm, and since it cant run over ttar. That being said, naga is definitely much more explorable that lando, since it isn't bound to running lo and has spikes. This and landorous are the defense killers that make fat so impossible to run right now.

This is actually probably the real #2 rather than lando, but I haven't used it or played against it too much yet. But yeah lead 6-0 kyub is almost as easy as lead zen mode gdarm. It literally just needs a single dd and icicle spear can do the rest. Non dd sets are manageable but the threat of dd often elevates them to high threat level. I don't understand how this was allowed but not the fish. But both deserve Ubers in the end.
Potentially Broken after the meta calms:

Its fast. Its decently strong. In this fast kill or be killed meta it can come up short on KOs and die to the incoming hit, but once the meta settles down i think U-Turn sets will be really annoying, and CC will always be a powerful cleanup option. Boots is not as good on this mon as they were on zera and pult, since those liked being at pristine shape to take a hit. Phero cant take the hit anyway so i say why bother? Maybe I'm just bad lol *shrug*

Setup sets seem slow at the moment, and specs is a laughable breaker with its 65 base speed. AV is good glue right now but nowhere near banworthy. As the meta slows this could easily marinate into a top threat, but mag isn't there yet.

Fast, strong. Perhaps the harder walls like pex and hippowdon dying to all the other crazy shit is giving cinderace more KO opportunities than it should have, but Ace still seems really, really strong from my playtesting.

Only run SD setup. And remember that even at +1 blaziken is really slow, especially if its adamant. These limitations have made this mon underwhelming for me. With the right matchup, once it gets to be +2/+2 to game is over, but those matchups can be rare. LO + flare blitz recoil can have Blaziken kill itself, and if it lacks protect you can switch in a scarfer as blaziken SD's to scare it back out. But by running protect you waste a coverage slot and can be walled by certain flyers, or just be forced into flare blitzing and dying. Dies to gene extreme speed and scarfers on faster teams, and it can still thud against some harder walls. Overcomeable flaws, but has been really underwhelming for me so far.

(pls add sprite)
For starters, I want to preface this by saying that regieleki is by far the worst mon listed. To be honest, regieleki is probably balanced in ZU. Why? Because it is complete stonewalled by any pokemon with the ground typing, even ZU pokemon with 50 bst. Its coverage is nonexistant, so it has no recourse against any ground type in the game. So why is it banworthy if it is so effortlessly walled? Because regieleki 6-0s any team lacking a ground type. Its got a stupid fast, very strong volt switch to weaken its checks and a pace that outspeeds most scarfers. So if this gets banned, it will get banned off of the same basis the fish got banned: since it forces teams to run a ground type. So I think regieleki will get banned? No, ground types are basically a stable of teambuilding already and are much more common than water absorb pokes. Is this overhyping its power a little? Probably. But nobody is running ferrothorn and the damage calc isn't updated yet so I don't know the calcs it has against electric resists. But while pokemon like dragapult are good, they are definitely never going to get banned. The fact that I can find logical reasoning to ban regieleki at all puts it on this list.
General Disappointments:

Lol we all know how these got butchered. They aren't bad but they aren't the meta breakers they were in the fantasy metagame we were playing before the official PS drop.

Zygarde is probably going to be broken long down the line, but in the meta we have right now its really bad for me. Others probably disagree, but for right now I struggle to find a defined role for Zygarde. Maybe its because everyone who uses this against me runs garbage bulky setup spreads which don't work against my teams, so I'm not exactly inspired to try and make Zygarde work. But in general it seems underwhelming when my opponents use it. Maybe I just expected more because it was ubers last generation.

I've fought 0 torn-t and 0 kartana. I've also used 0 torn-t and 0 kartana. This means they are PU pokemon and are terrible. Objectively speaking.

There is a better version, people who use this either are looking for gen 7 vibes or didn't get the memo.

So bad its attacks do shit damage just use latios. If you can't tell I lost a few games cause this thing is weak as hell.
Of course, other mons are good and others are fun, but these are the standouts to me so far.