The critics have been cruel. The ratings are middling BUT they miss the point.
This is a typical Agatha Christie-esque who-dunnit.... take a group of people at a country house and have a dead body type of whodunnit.
So it becomes a sort of puzzle.
1. Attractive cast - check
2. Attractive locale - check
3. Characters with secrets - check
4. Characters with motive - check
5. Characters with opportunity - check
6. Murder victim who may or may not be a nice person - check
7. Big reveal at the end after assorted red herrings are resolved. - check
Now comes the hard part. Is it well done?
Actually I think it is. It does drag at little in the middle but the resolution works.
As for the cast. I think they all do quite well and Nicole Kidman whom I have never quite taken to actually surprises me. I usually find her cold but in this, at the end, I fully understood her character. Her much maligned accent actually makes sense in the circumstances.
Give it a try. It is not the greatest mystery ever but it is fun if you just go along for the ride.