All of Big Mom's children are dangerous, not only the Sweet Commanders and not only the other Devil Fruit's users. Even the infant children of Big Mom are dangerous! We should make a count on the confirmed members of Big Mom's Pirates who went to Wano and what powers they have.
+ Perospero: He left the ship and was on the Onigashima's battle. He was defeated by Nekomamushi, and we don't know what happened to him after that. He was probably sent to Udon along with the other Beast Pirates defeated, and unless he escaped, he might have been a victim of Ryukuyu's power. We need confirmation if he's alive or not.
Now, about the ones who were still on Big Mom's ship:
- Smoothie: The only remaining Sweet Commander, which makes her really strong, and has a Devil Fruit to extract juices out of anyone or anything.
- Daifuru: He's one of the strongest Big Mom's Pirates, he's a Devil Fruit's user and he has the power to summon an powerful genie.
- Galette: Devil Fruit's user that has the power to control butter to immobilize her enemies. She has a strong will, a great physical strength and uses a gatling gun.
- Mont-d'Or: Devil Fruit's user with the ability to imprision anyone and anything inside books. He has a strong will and he's a deadly sniper.
- Compote: Eldest daughter, and it's said her power matches that of Katakuri and Smoothie; even if she's not a Devil Fruit's user. She also have a strong will.
- Snack: Not much is known about him, but he was a Sweet Commander before being defeated by Urouge; so we can assume he's still quite powerful.
- Amande: No Devil Fruit, but powerful sworswoman and known as one of the deadliest members of Big Mom's Pirates.
- Effilee: No Devil Fruit, but strong will and lethal gunner.
- Broye: No Devil Fruit, but a very dangerous swordswoman.
- Custard: No Devil Fruit, but strong will and a very strong swordswoman.
- Raisin: No Devil Fruit, but powerful swordsman and Haki's user.
- Angel: No Devil Fruit, but strong will and an excellent archer.
- Kato: No Devil Fruit, but a stron will and a very dangerous swordsman.
- Nusstorte: No much known, except he's an excellent sniper.
- Basskarte: No much known, but he's quite strong and manipulates fire.
- Dosmarche: No much known, but he's a very efficient swordsman.
- Tablet: No much known, but's he's a good swordsman.
- Mobile: No much known, except he's a good swordsman and gunner.
- Cornstarch: No much known, except she has a strong will.
- Flampe: One of Big Mom's youngest childs. She's not really powerful, but she knows how to hurt her enemies playing dirty.
With a group made of these individuals, I believe the Big Mom Pirates are powerful enough to be a problem to a fleet of Goverment's Ships; maybe even capable of resisting for a while the power of an Admiral.