Based on the plot, one would expect the show to depict a possible outcome of a fragile, young psyche trying to cope with trauma and disappointments caused by entitled peers and negligent adults in her life.

This is a powerful theme, but the execution is mediocre in the first season, rapidly deteriorating thereafter.

One of the obvious problems is that some important actions by key protagonists don't necessarily dd up and that goes for all four seasons.

Another significant flaw is that in season 2 and beyond, the show is going out of its way to make keep some characters relevant at the expense of those who might have served the main plot better.

That said, few shows have avoided a drop in quality after the first season and if you are intrigued by the season 1, the chances are that you would carry on watching until the last episode in season 4 because the show grows on you despite all its flaws. Otherwise, I would not recommend watching the season 2 and beyond hoping that the show gets better because it doesn't.

Therefore, the 5/10 rating reflects the balance between a gripping theme and its underwhelming execution.