Cannot agree with the basic setting of the hell. A hell is meant to guide people's behaviors, and that makes the setting works and believable in a story. Though with doing nothing but cursed by someone but have to go to hell? I cant stand this setting. It just serve the main characters, not helpful for any of others in this world, and is far beyond what "hell" should mean in every cultures in humanity.
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Right, im basically talking about just one episode about that poor nurse cursed to the hell. I kind like the story with just a little bit weired feelings before this episode, but after this one I finally know what I am feeling about. It is the setting itself is nonsence.
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We can do a little bit more comarison, one is the famous QB thing. QB let girls to trade her whole life, future, to guarantee a wish. Something must be done to trade for another thing, some benefit must taken to go to the hell. One is the death parade, in which someone can judge who should go to hell and who should go to heaven, ONLY after he tested their behaviors. And even more, he can also correct his mistake after making a decision (in a short while). This setting is pretty good for both give a reasonable situation to highlight the story and growing of the person who make decisions, but also reasonable for other person who is in the situation to be judged. The whole story, the setting is fulfilled. Someone must do something first, then go to hell as a trade-off.
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though I would like to say, the anime is good, but in other perspective, such as the act, shot, good drawings, nice music, ...
though the core part of this anime is definately story, and It tried to let people think:

1. main character's growing and thinkings.
2. not to curse others? basically.

though these two main part both heavily lie on the core setting of the hell, and as I have said, this part is very bad and unbearable.
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Also, I think there are some trend we can see from the first two episode, of the broken of the core setting is that, the anime work too hard to let audience to feel horror, to make the scene dark and scary. It is not bad give people an image that the hell is bad, don't want to go, and the cost of cursing other is too high... though only in a good setting this can be reasonable, otherwise it seems like "oh you go to hell, and I will follow you in severall years when you climbed to management in the hell and I am still a newbee."
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So if the core is a little bit changed, this might feels good. from 30% straight to 80%. such as curse someone to death will cost you go to hell, maybe immediatly, that is kill 800 enemies to trade for 1000 friendly.
I think making this kind of fiction, really need to read something already exist in current culture, instead of building a new one. Something that already exist for a long time must have its reason. Otherwise please build a new concept, and describe it in details, that makes people won't relate it to one already exist. Mabye change hell to some other concepts, like "the beyond" or something, and describe it as some court or something.