I have a major problem with these particular Miss Marple mysteries in that I don't remember - or don't recognize - the actual stories because I read them so long ago. I think possibly the only way to watch these is if one forgets they are supposedly adapted (and apparently, all they take is the title) from the Christie novels.
The production values for this series are quite high and the casts are very good. In this one, we have such stars as Timothy Dalton, Rita Tushingham and someone who reminds me of Zac Efron in ten years, James Murray. Miss Marple herself (Geraldine McEwan) never seems to be the main character; they manage to turn the footwork over to someone else, and then Miss Marple solves the crime. Now, in the books, Miss Marple solved the crimes by being an excellent observer of human nature, based on the people she knows or knew in her town of St. Mary Mead. This Miss Marple very rarely mentions St. Mary Mead or compares any characters or incidents to the people she knew there. She is also a little too sly for the Miss Marple in my mind.
It seems a shame to upset so many people by trashing the books, renaming the characters, and redoing the plot.
I'll take issue with one thing that was complained of - the fifty minutes it took to get to the murder. Years and years and years ago, there was such a thing as a story buildup. If you watch the movie San Francisco, the earthquake doesn't happen until the last half hour or thereabouts. One got to know the characters and their interpersonal relationships first. Of course, this type of storytelling has gone out of style. If you're going to have an earthquake, a ship sinking, or a murder, it has to happen in the first five minutes. Since I didn't know this story from Adam, I have to admit the buildup didn't bother me. It's done so rarely.
All in all, one star as an Agatha Christie story, five stars for the production values, the acting, and the mystery. It just has NOTHING to do with anything Dame Agatha wrote. What's the point?