There were so many stories they could have extended
After binge watching the season I think they could have milked some storylines for much longer, like:
-the colleague hitting on her
-the nosy neighbour who is getting suspicious
-is the doctor good or bad, does she only want to experiment
-him being mistaken for mentally ill for more than once
-the neighbour cop giving them more killing targets.
And i could do with less of the annoying daughter being a "badass", the scene with her gassing the drug dealer's home for her (never to be seen again) best friend made me cringe.