I have.
And won. Plenty.
Don’t get me wrong. I hate Briggs.
I find she’s too easy for how effective she is- and view her as a perfect example of the “problems” you have when a heroes skill floor is notably lower than then skill floor necessary to respond to them.
But she is counterable. She has limitations to go with her strengths- even if they take more skill to utilize against her than she needs to use her strengths against you.