Not great, but in many ways very good, and definitely worth seeing. It's about the pastor of a small church in a small New York town, a part of what we generally refer to as one of the "mainline" Protestant denominations, presumably the Dutch Reformed (I can't remember whether this is stated explicitly or not). Like so many such churches, its membership has dwindled and its once significant role in the life of the area is now literally a thing of the past: it's not much more than a tourist attraction, complete with souvenir shop. "Sorry, the t-shirts are all 'small.' We're expecting more soon. But the caps are great. One size fits all."
Pastors are not supposed to have to engage in petty merchandising of this sort, and the Reverend Ernst Toller is clearly not happy about it. He's a serious man who takes his faith seriously. He reads Merton and I think I also saw Chesterton's name in the stack of books that is glimpsed briefly. Rubbing salt in the wound of his church's (and therefore his) near-irrelevance is the presence of a nearby mega-church which not only has several thousand attendees but subsidizes First Reformed, which is pretty humiliating for a 250-year-old church.
Toller is having a crisis. I started to say "crisis of faith," which it is, but it's not only that. He is deeply isolated and bears a heavy burden of personal guilt. He is also seriously ill. The crisis begins to come to a head when the wife of a troubled young man comes to him for help.
At this point, if you know Bergman's masterpiece Winter Light, you start thinking of it, and indeed there are so many important parallels between the two films that it doesn't seem possible for them to be coincidental. There is also at least one strong suggestion of Bernanos's Diary of a Country Priest.
Those comparisons, I'm sorry to say, are not really to the benefit of First Reformed. I was somewhat disappointed in its resolution. As my wife said, in the end it sort of side-steps the God question, which is not the same thing as leaving the question unanswered, as I think Winter Light does. Still, it is really, really well done, and I don't mean to damn it with faint praise. As I said, it's very much worth seeing.
P.S. I should mention a fairly significant problem I had with the DVD (from Netflix). The film is shot in 4:3 aspect ratio. On our flat-screen TV it was displayed in whatever that standard is (16:9 I think). This resulted in that annoying horizontal stretching of the picture which seemed chronic on flat-screen TVs when they first appeared and made me wonder why people wanted them. I didn't have any way to change this on the DVD player (it's messed up, I won't bore you with the details), and it didn't occur to me till the movie was over and I had sealed the disk in its Netflix return envelope that I might have been able to change it in the TV settings. I guess it says a lot for the film that this problem didn't ruin it for me.