Huntress gets taken down by metahumans and hard core professionals. Spoiler gets nabbed by *Cluemaster*.
Simply put, any comparison between them is unfair, as Huntress is in another weight class. And while Spoiler has listened to instructions every now and then, she makes a point of defying them on a regular basis. Cass had to knock her out three times because she didn't feel she could trust Steph to do the right thing.
And yeah, members of the Batclan have ignored Batman dozens of times. But in doing so, they shown their own good judgment and ability. When Steph does it, she acts short sighted and impulsive and loses control of the situation.
Simply because others have done something, does not mean someone else has the same ability. Especially in the Batclan, a collection of people who are either highly trained, highly intelligent, or both.