Terrible. Some phenomenal talent in the cast, and an amazing home as the setting. But, it's twisty for the sake of being twisty. No actual character development or valid reasoning behind the twists. If you care about things like...authentic, nuanced characters or a tight, rational plot, don't watch. If you love films that throw all reasoning to the wind but, but have twists! Then have at it.
P. S. The "stellar" reviews are obviously fake/ paid for by the distribution studio. It's that bad. Helen Hunt is unrecognizable and the heavy-handed score doesn't fit the film.