I loved the first two series. I think Olivia Coleman and Tobias Menzies in Series 3 and 4 weren't good but were way better than Imelda Staunton and Jonathan Price. I have watched all of the episodes of Series 5 now and Imelda Staunton is awful. She does not improve- mean-faced, sour, little, misery throughout. Absolutely joyless portrayal with none of The Queen's positive characteristics. She shows no compassion at all. Everything about her is drab, grey/brown/wrinkled and small- physically, in spirit, mind and intellect
Jonathon Pryce is not Philip and captures little of him after episode 2.
The portrayal of the Queen Mother is dreadful- really dreadful. She has only been well-portrayed in Series 1 and 2. Marion Bailey was awful as well in Series 3 and 4 but this current actress, Marcia Warren, is the worst.
Elizabeth Debicki is great- best Diana I have seen in anything although the writing is focussed mainly on the marriage and many of her other behaviours are missed. She is too thin and tall though- Diana was much stronger physically by then. I think the portrayal of the marriage is not unsympathetic to her or Charles.
Dominic West gets Charles, on the whole,I think- especially his mannerisms. He's too hefty to be Charles though and not quite effete enough.
The stars are Olivia Williams who is excellent as Camilla, Natasha McElhone, Lesley Manville and Elizabeth Debicki. Also the actor who plays Mohammed Al-Fayed- although his seedier side does not emerge and he's been shown quite sweetly. Many of the smaller roles are well-done- Haznat Khan, Dodi, Martin Bashir, John Major, the valet to Al-Fayed, James Coltman (played by an actor from Motherland).
There are some awful performances: Imelda Staunton, Marcia Warren and whoever plays Marmaduke Hussey- who is truly awful.