I have to agree that these stories are not so good but why people hate them? Well, I can think of a few reasons, first they are made in a superficial, almost superficial manner.You can clearly see their patter hardly changes.It's like giving them a diferent coat of paint each time and saying they are something new.
But their main flaws are lack of substance and and a blunt narration devoid of any substance!
Also they lack dialogue, a really good naration could fix that, but unfortunately the narration is really poor and boring!
Actually I think the characters are more likely to die of boredom rather anything.
As for the characters, I've never seen such hollow representations, I think Aoi's stories deserve a special prize for how empty his characters are!
They lack any kind of emotions, they behave like autists and resemble meat robot puppets!
These things coupled with the fact that Aoi's stories are literarly flooding the lit and smothering the other authors are the reasons why people with higher standards that don't want to eat everything they are served are hating them!