Badison was AWFUL. I've disliked the antagonists before but never have they had zero redeeming qualities. I mean, Vee was a mostly selfish, terrible person but she had flashes of caring about people where you at least got the impression that she understood how normal humans are supposed to act and tried to fit in but was just too manipulative to make it work. She had some complexity that made her interesting and fun to hate
Pennsatucky was season 1 antagonist and she was actually funny, which was a plus. She also had an interesting backstory even just in season 1 where you felt bad that the orderly made such a mean comment (even though they didn't deserve to die for it). Piper was never super likable so sometimes you even enjoyed Pennsatucky's comments to her
Badison - nothing. Her backstory is that she's a whiny baby that breaks and throws things and unintentionally set the wrong girl on fire. You couldn't love to hate her, you could barely hate her because you were too busy cringing when she showed up on screen.
And this is the first time I cried at the finale. Diablo and those flowers... I agree that it was the twist we should all have seen coming but I didn't.