Honestly, the first 6-7 episodes are absolutely great. The teen actors are amazing and the story is breathtaking. if you get to episode 11 you can then jump directly to episode 16 without losing anything of any importance in between (except the scene at the library that is quite cute). Same in between ep 7 to 11. Most of the characters has some form or another of psicosis and instead of getting a treatment, they make living hell to all the others.
I got sometimes the distinct impression that the writer had a big problem with women and was trying to expel his hate for women writing down this awful scenes.

I would say the beginning it's a MUST watch, and keep note of the actor that where interpreting the teenagers, cause they're gonna do good things.