I just want to emphasize that I think
@Slips suggestion of a safe f2 is the best change for Scorpion. It would keep him honest while making his up close game more threatening.
I'm not for paulo's suggestion of make f2 a hard knockdown overhead. My reasoning is I don't want to be forced to guess cancel the first hit of f2 to get a full combo. I like confirming that my f2 hit without having to commit to something unsafe. I think f2 should primarily be used for footsies and armor crushing. In its current state f2 rewards good footsies which is one of the reasons I enjoy ninjutsu so much. I understand that an overhead f2 would be very good but imo the character doesn't need it to be viable. Also I think it would make him somewhat overpowered. My reasoning is that once in the 50/50 range of f2, b3 and d4 players will be eager to step back out of that range which would make b2 so much more of a threat. He would also gain a real looping vortex that would be somewhat safe with meter. He would maybe shoot to the top of the tier list if this happens.