Greetings from Lithuania.
"Midnight Mass" was a terrific series about life, death, love, and loss. Sounds epic yet on the surface this show was about people on a island trapped in some things that goes beyond usual. I will spoil nothing, but the whole concept and plot is highly religious. Yet as not being much religious person myself i would like to say that its a highly rewording experience to watch this show - its way more then it looks like.
Directing by Mike Flanagan of which I'm a fan was amazing - he is definitely my favorite director when it comes to horror genre. Yet "Midnight Mass" is not a horror show. Its starts as a drama, then it moves to a mystery and by the end when everything was reveled i was fascinated by it for its idea, concept and plot. Acting was amazing by whole cast , but exceptions were Samantha Sloyan and Hamish Linklater - they were both out of this world good, some award must by won here. Also it was a dialog heavy show - there a lot of monologs were characters are just speaking for like 10 minutes straight. Just to be warned.
Overall, without spoiling it much, i can say that "Midnight Mass" is not a horror series. Its a bit of a mystery drama and at its core it is a series about fate and what would happen if any of us would get a second chance. And what a "miracle" can do to a one person who truly was a believer whole his life and whole his life he was working for god but saw no consequences for doing good.
The ending of a show was amazing and kept me thinking about the whole thing i saw and heard. Also there is a speech between characters about what happens after death - its one of the best dialogs and acting i saw in years.
And if you think more deeply - at its core "Midnight Mass" is a masterpiece which will probably won't be understood by many.