I would even rate this a little higher than 7 but it's not allowed.
Cassandra is a quite original idea and execution. First and foremost. There is drama and excitement. The viewer can feel both sympathy and hate for the robot and I think her backstory was well portrayed, giving us a good idea on her motives. There are also various moments of agony where you are invested in how well this is going to end up for the family. Gore is not spared, this adds a lot of reality and psychological tention.
The writers did a good job of putting the script together, there are no plot holes left open and although you can go cherry picking on certain moments that are questionable, overall the script is tight and keeps the play together the way it was intended to be.
The performances will not win any Oscars but are solid enough to be believable and get the movie going. Obviously the better and most standout performance is Cassandra's, I guess they tried to nail this role as much as possible.
The series is not too long to lose focus, it is limited but this will keep it memorable. A standout entry in the sci fi world.
