Well worth seeing just to watch Oldman's performance.

Rating: 10/10 (24 October 2017)

At this point, "Darkest Hour" has an overall rating of 5.3. I do not understand this at all, but the film has not actually been released yet and has only been seen in film festivals. I assume the overall score will increase considerably--especially since the two reviews for it were quite positive.
Now I must point out that I am a retired history teacher and I consider Winston Churchill to be perhaps the greatest politician of the century. So, I clearly have a bias and predisposition towards liking the movie...especially if it's done well. Is it a crowd pleaser? Maybe not, as the average movie-goer (especially teens) might not enjoy this or care a lick about the film.
The story covers only a portion of the month of May, 1940...just before the fall of France during WWII. Prime Minster Chamberlain is about to be tossed out of office, as his appeasement strategy with Hitler has turned out to be completely stupid. In his place, some hope for Churchill to be the next Prime Minister...though some forces are working to depose him as soon as he comes to power. At the same time, the war is going as badly as it possibly can. Can Churchill survive this? Well, of course...duh, it's HISTORY!
The reasons to see this are two big ones....the film has achieved the look of 1940 beautifully and Gary Oldman provides an Oscar- winning performance in the lead. If he is not at least nominated for this top award, I will be completely shocked...and he really managed (along with ample prosthetics) to LOOK and SOUND like the great man. Great job all around...and a perfect film.