I think Sammi is not the worse character
if majority of the people are pissed off this means she did her role way too good. I hate her don't get me wrong but people hate her for doing one thing; ratting out on carl, I also dislike that but anyone in her position do the same if they had the choice to because no carl, for no reason at all framed chucky who was such a kid with special needs. Sammi is a mom who never had a father, who craved validation from men by sexual acts. she wanted to bond with her step siblings too because she never had such thing in her life, it was only her mom so I cant blame her for the things she did because she barely had a childhood.