People should really, REALLY re-read Robin vs Black Maria chapters.
Black Maria was awesome to see in battle.
Illusions, proficient with hand to hand and the staff weapon, flames and webs to control the battlefield, etc.
A really fucking awesome arsenal.
I like Sasaki. His animal form is my favorite among the beast pirates. His helicopter thing legit made me laugh a lot and was lot of fun reading him fighting Franky.
But Sasaki is pretty fucking limited. It's CHARGE CHARGE CHARGE. He charges while in animal form. He charges while in hybrid with the spinning shit.
And considering people were hooked on the "Whoswho and Sasaki are close to the Calamities" and "black maria probably is the weakest", seeing Black Maria with a bounty slightly higher than Sasaki was a treat.
Despite the fact that Oda refuses to give Robin fights, Robin has always been pretty fucking OP. Putting Franky a tier above her is just plain disrespectful. It's a false perspective due to the fact that Franky has way more fights than Robin.