OK to have spoilers by now?
I ended up loving Cary and Sherry by the end. I wasn't expecting that. I laughed out loud when I saw them on Ted Talks 
Love had to die really. I slightly preferred her over Joe, and she definitely did unhinged-and-about-to-kill-you face much better than Joe, but she's not the main character, so.
What gets me about both of them is how sloppy they are, sometimes stupidly so. Joe ripping his mask off in front of Henderson. Love screaming about how she killed Natalie while the neighbours were upstairs. Even in season 1 it was absurd how often when Joe was stalking on someone, and watching them from inside their home, they would only have had to turn their head slightly to see him. That scene with Beck in the bath and Peach and Joe watching her from different doorways was absurd.
I kind of hope season 4 will be the last. I hope he doesn't manage to find Marienne and her daughter. My feeling is that Ellie will be the one who finds him and brings him down.