1. Is 1 of the only 3 souls to be able to reliably support a PF build without help from other himes.
2. Debuffs and heals can be covered by other himes
3. Does 25% def break herself on burst, depending on setup can require less himes dedicated to cap and more dedicated to utility and dmg
4. Doesn't die as easily compared to many other souls. Only Joan can compare in survivability. The best place currently where this attribute shines: LRag.
5. Dmg output is pretty good, and in this game, having good damage output = good character.
6. Only like... 2 or 3 team buffs from souls really matter in the meta anyway.
Well, she ultimately gets overshadowed by Shingen.
This all matters for none if your entire team is unable to hold their own though. Use the other souls as need be if this is the case, as Hercules isn't exactly the best team player.