It is sad when a series starts out so very strong, you wait for next week, even re-watch the current episode, again. Then the slide starts down the slope. Usually the writing is the first symptom of a terminal disease. When you start "phoning it in", it shows quickly, foretelling what to expect. Again, a great cast of actors/actresses, who can only do that which is given to them. So many of the regular cast and guests are favorites from watching them on other shows / movies.
Re-watching the seasons again, my wife is hanging in there. I am finding myself cringing when Brut is on-screen. Her character is way over the top, and then thePC required affair between her and Shaw, is building. While the drama (is) building, I find myself scanning the news on my tablet, and drifting away. This is endemic in American writing for tv and movies. Anymore we stream Acorn, BBC, Britbox and a few others. European programing and shows similar to this, have better characters, plot lines and series longevity..Line of duty snd unforgotten come to mind. Look overseas and learn🤔😔