Aren't the furies the same ladies who give Superman trouble?
I've seen them do fairly well against Wonder Woman and Big Barda. I remember reading that one of them was about to kill Barda, when they comfronted her in Superman/Batman (Supergirl). If it wasn't for Diana she would have been dead. Morever, they captured Supergirl and killed her friend (can't remember her name).Anyway, the furies were trained by Barda to kill in hand to hand combat, weapons, etc. They're ruthless, and above all else evil. If Sue is able to defeat all of them, then the fantastic four takes the victory. If not the Furies, but sheer numbers will overwhelm the heroes.
I just asked the question, because many forget who they've faced. But, thanks for noticing.
Your right, I forgot they wen't up against Firestorm a couple of years ago. I have to reread those issues, to remember how the fight went. If i'm not mistaken they had the advantage up until Orion showed up.