Vulcan Punch smashes a lot of things insanely fast. Hordes of infantry are even less of a threat than before, tanks are quickly and easily dispatched, and it is even helpful on some bosses (Mission 5’s front and lower sections being a prime example). It’s high-risk, but high-reward with practice. The only thing it doesn’t work on are flying enemies and those little mechs in Mission 7 that will stab you if you try it.
And again, I was basing the tiers on both Story and Combat School modes. With Combat School giving you infinite ammo on all weapons in most scenarios, and disallowing special weapons completely in the remainder, Ralf gets even better while Fio gets slightly worse. Tiering based strictly on Story mode would have Fio and Ralf on even terms IMO, but the entire game as a whole is a different beast (again IMO).
At this point though, I think we’ve both had our say and probably aren’t going to change either other’s minds on the issue.