I'm trying to watch all Oscar nominees this year, and today I watched Darkest Hour. I have to say I'm pretty disappointed. Yes, Gary Oldman is one of the best things in this movie, but that doesn't mean much, really. His acting is OK, at best. His voice keeps reminding me of South Park's Cartman and he is always either whispering of shouting. He looks like a caricature of Winston Churchill from a sitcom, honestly. The directing is bland, but there are some interesting shots sometimes.
The script is the worst part. Darkest Hour is basically two hours of men in suits talking to each other. Filmmaking is so incredible because it allows you to tell stories through dialogue and images. But Darkest Hour tells its story entirely through dialogue, so there's no reason for it to be a film. Every information you get from this movie is conveyed through dialogue. They should have just made a radionovela instead.
I have to give credit where credit is due, though. The makeup is amazing.