Law's power is good, but not this unbelievably broken. He also was important to overall plot of the arc he was in, whereas Bonny is treated as the most important character despite her not actually being that important to the plot of this arc.
Sure, she has the typical super sad backstory but that backstory and her character in general really don't have much relevance to the plot or its villains in any meaningful way. Law on the other hand had deep roots to the Dressorosa arc and its main villain
I am just saying she is just absurdly powerful and treated with a reverence in the arc that her character doesn't seem to merit and really hasn't earned.