I recently watched Winds of War for the second time. I agree that some of the actors were miscast (definitely Ali McGraw) but for all that it is a great mini-series. If you haven't read the book, McGraw may not annoy you that much. I agree with the reviewer who said to look for acting gems in the supporting cast. I especially liked Jeremy Kemp as General Armin von Roon. Robert Mitchum did do a great job despite his being over the age of the character Victor Henry. Historically, the major events were accurate and besides a good story it is also a good history lesson.
Highly recommend.