This film was long. And I mean 255 minutes long. And the acting is very strange: theatrical but of a kind you don't see in theatres either. Here's what happens. Each character is in his or her own world and when two or more characters do a scene together, each one either overacts or underacts, and doesn't get involved with the energies of the other characters in the scene! Very odd. Only the actress portraying Ellen Dean gives a balanced, solid performance, and engages with others (and Isabella is getting there, too, but unfortunately Cathy isn't), and Ken Hutchison gets the pitch of his overacting just right as Heathcliff. He does a superb job, I think. The rest of the cast are unimpressive. As I said, they act together in scenes but are not involved with each other's acting, and their energies just don't make this televised play what it could have been. Because it does have a few things going for it: Ken Hutchison is great (only the others don't resonate with his energies, and in the end it seems as if Hutchison, too, gets his acting wrong, alongside the others); the film is true to the book, as others have noted (I for one read the book a long time ago, but even I remembered lines from the book!); the atmosphere of Wuthering Heights is there in the manor sets; and the rainy and misty Yorkshire moors are a great element in a dark, gloomy story.
It was a weird piece of BBC filmmaking and the first parts drags on and fail to engage, but in the end, after watching the whole 5 parts I can say it was worth it. It got me thinking about the whole story. The plot is wonderful, and it's a good thing that they kept the whole story in the film (I understand other versions focus on the love story between Heathcliff and Cathy and also take liberties with the plot).