Maeve becomes good at everything.
Maeve continued her journey to superhero in Season 2 as her code continued getting upgrade after upgrade with the help of the Delos techs. After mastering the software, Maeve's mind control abilities hit a new level as she was now able to guide hosts wherever she wanted. So, she freed herself from the underground lab where all the dead robots go, and enlisted Hector's (Rodrigo Santoro) gang and Lee Sizemore (Simon Quarterman), Westworld's Head of Narrative, and headed back into the park to continue looking for her daughter.
Throughout her adventure, we watched as Maeve battled a whole assortment of threats, including her trip into Samurai World. As hopeful as her story arc became, Maeve's journey ended in tragedy. As Dolores and Bernard got to the Valley Beyond, Maeve was stuck in the middle of a battle between the Ghost Nation (the Native American hosts) and the Delos security team. While she does set eyes on her daughter, walking with sentient Ghost Nation member Akecheta (Zahn McLarnon), she gets gunned down and fails to reunite with the girl.
The Man in Black is also losing it.
So, William was pretty cool, but the Man in Black isn't a good guy, at all. After his first adventure in the park, he marries Logan's sister, therefore making him a member of the Delos family. As we watched Logan struggle with drug addiction, eventually dying of an overdose, Season 2 shows that William basically seizes the power that Logan squandered. He becomes a key investor in Delos, and returns to the park often.
Going black hat and pursuing every sort of violent delight eventually spilled into his real life and when his wife discovered just how much of a monster William is, she killed herself. This further sent William down the proverbial spiral, fracturing any relationship he had with his daughter. When he went back to Westworld, with the goal of destroying the whole park, he is visited by his daughter. She tried to reconnect with him, but the Man in Black was too swallowed up in the game of the park and killed her, believing she was a host put there to screw with him.
Things get a bit confusing from there. William tries to kill Dolores and fails. He does get to the Forge, but we're not exactly sure what happens after that. He was apparently rescued by the Delos guards during Dolores's big escape, but the details behind this part of the story were omitted from the series. What makes matters worse is the post-credits scene that follows the Season 2 finale, which shows William, in the far-off future, hanging out with his daughter and being tested for "fidelity," insinuating that in this stage of his life that he's a host.
As Westworld plunges further into the real world in Season 3, we'll have to see how all of these open questions from two seasons of in-park drama play out.