I was a big fan of Lost while it was airing. I know it had its naysayers, because I used to passionately defend the show against them. With the benefit of hindsight, I can definitely see how the plot became a mess; it’s clear that the writers didn’t have it all fully planned out, and had to sacrifice many loose threads in order to bring the story to a conclusion. But I felt at the time, and still maintain, that the ending was emotionally satisfying on a character level, even if some/many of the mysteries went unexplained.
The same could be said of Servant, which also offers plenty of supernatural twists, albeit on a much smaller scale. (Instead of a whole island, with dozens of characters, Servant takes place almost entirely in one house, with a primary cast of four.)
I said in my previous comments that in the end, I only cared about the main emotional resolution, and the show delivered. (I was also right that it waited until the second-to-last episode to deliver it.) When Dorothy, the mother, finally realizes the truth that she’s been suppressing for the entirety of the show so far, it’s appropriately heart-wrenching, but also feels like a relief. It’s the only way they can move forward from the tragedy.
Nell Tiger Free as Leanne remains the MVP for me, even though I didn’t love the turn that her character takes in season 4, becoming a full-on evil wacko killer. She was much more interesting when her nature was ambiguous, even to herself. But the disquieted, damaged innocence that she carried in earlier seasons does return in the finale, which makes her fate bittersweet.
I’ll also shout out the rest of the main cast (Toby Kebbell, Lauren Ambrose, Rupert Grint). The show works mainly on the strength of their performances. They make the more ridiculous supernatural plot elements much more believable.