Yes, Hades isn’t evil, necessarily. I mean he’s a god of the underworld but SOMEONE has to do it! And as far as Persephone goes…um….let’s talk about Zeus and the stuff HE did. But Christian influence is what it is and the idea of a god of death being evil became the norm. With Satan there is typically a “fall” from Grace; Lucifer tried to upset the balance of heaven and paid by being expelled. And even that only comes about after a lot of rereadings of the old texts and a lot of cultural interaction. Ha’Satan just meant “The Adversary” and was part of God’s council, mainly designed to argue other cases and points. The idea of him being the Morningstar and falling from heaven and all that jazz…later developments. (thank you Zoroastrianism)
Hades simply got a job that someone had to have. Also, I said this in another thread but the Underworld isn’t really brimstone and fire filled like we imagine Hell (our images of Hell are so terrible in order to make heaven and Christ that much more palatable). I mean this is how Homer described Elysium
to the Elysian plain…where life is easiest for men. No snow is there, nor heavy storm, nor ever rain, but ever does Ocean send up blasts of the shrill-blowing West Wind that they may give cooling to men
Tartarus is a bit more Hellish, something Christians picked up and ran with. Judgment and punishment that fits the crime (Tantalus, Sisyphus)
Hades itself is divided into fields–the Field of Punishment (and Hades often set punishment for those individuals) and the Field of Aspohdel (people who did not commit crimes but who lived an ordinary life).
There is even an Isle of the Blessed where people can be reborn (hint: how S5B end)
It’s worth noting that Hades is often hated by other gods but it’s largely because he represents death, something that is anathema to the gods. For immortals, death is such a strange concept that they bear no love for the god of it. But Hades is not a devil. Humans, of course, do not love him the same way no one in the modern age loves death.