Comparing the paradoxes to already existing pokemon, assuming that their abilities don't do anything without the legendaries:
Great Tusk - Almost the same stats as

with speed being the main difference, it's 1 point slower than

, assuming it gets to keep Donphan's Rapid Spin, it looks very similar to Excadrill
Brute Bonnet - The stats are very similar to

but signficantly slower, Spore would make a difference but despite being much bulkier than Breloom, not having an ability will be rough considering how impactful

and

's abilities were/are, unless it gets a way to boost Atk unlike regular Amoonguss, I don't see it being better than any of these three mons
Sandy Shocks - The most unique one so far, it'll ironically be a great switch-in to regular

, I honestly don't know what to expect from this mon but it'll be cool to see it in action
Scream Tail - Please
don't let this abuse Eviolite, the movepool will matter a lot, hopefully it'll get to keep Wish + Teleport from regular Jigglypuff, it has good bulk but the high speed doesn't mean much with mediocre offenses
Flutter Mane - Probably the strongest one so far, 135 SpA with 135 Spe would make it faster than

but slower than

and speed tie with

, hopefully it will get Moonblast unlike a certain Fairy type with 136 special attack, it'll have unresisted STAB coverage unlike Spectrier. Bulk-wise it's physical bulk is inferior to Spectrier on paper but not being weak to Knock Off is big
Slither Wing - We already have two (albeit very different) Bug/Fighting types with 570 BST

, this one has a much more well-rounded statspread, not sure if that's good or bad
Roaring Moon - Physical

but faster and stronger, would be the first actual dragon to get both DD and Knock Off, it'll either be great or get walled hard by Fairies, judging by current :salemence: ,it doesn't have a good Steel or Poison move, Steel Wing just doesn't hit hard enough and Iron Miss has terrible accuracy, Salamence doesn't get U-turn either
Iron Treads - Lowest offensive stats of all the paradoxes, it's honestly very close to the other Donphan form, the bulk is redistributed, it'll be one of the fastest Steel types in the game although being slightly slower than

and

is kind of unfortunate, I'm not sure how well this will do
Iron Moth -

but more offense oriented, I don't expect this to be worse than current Volcarona, the +10 Speed will certainly help
Iron Hands - No Guts, gaining Electric STAB would help hit Flying types but again, not having Guts means that the difference in damage won't be that big, it's also substantially bulkier than normal Hariyama, I see this as an improvement although it would be much stronger if we got an good non-signature physical electric move
Iron Jugulis - Assuming it gets Nasty Plot like regular

, imo it's most similar to

except it's faster and hits harder at the cost of some bulk
Iron Thorns - Compared to the original pokemon, it endures a MASSIVE decrease in special bulk due to having a lower spdef stat and no sand, it'll be taking about 73% more damage from special attacks and imo it doesn't gain that much in return due to the physical Electric type conundrum, Mega Tyranitar is certainly not a good precedent either (Thunder Punch will not 2 HKO Phys Def Corviknight without at least 192 Atk and at 252+ it's not guaranteed)
Iron Bundle - The new fastest Ice type in the game, having the same speed as

's zen mode form, Delibird was one of if not the worst pokemon in the game and now it will actually be good
Iron Valiant - There aren't many mons I can compare it to, Infernape and Mega-Lucario seem to be the closest, of all the paradoxes it's the only one with mixed offenses, imo its viability will depend signficantly on whether or not it gets good coverage to hit the Poison type Regenerators
Overall there are a lot of powerful new mons here but also a few that aren't as fortunate