Given how mysterious and confusing the episode and its events were, it definitely makes the viewer wonder what is going on and where all of this is going.
Sora no Otoshimono Season 1 Episode 1 Review-A Full-frontal Hero Arises in the World!
Some other shows try to downplay such controversial aspects, but this show is embracing them openly and not shying away from them, which helps make them work.
How Not to Summon a Demon Lord Episode 1 Review-The Demon Lord Act
Diablo is clearly not the nicest person in the world. He also seems willing and even eager to engage in shady, gray area moral decisions to achieve his goals.