Superficial. Talk about dumbing down! I suppose, to be fair, there are millions in Britain, and even more in America, who have no idea who Winston Churchill was and the service he performed. Doubtless these people need to have the basics spelled out. However, the result is a the equivalent of a Disney cartoon version of A Christmas Carol. As an English viewer I also could not escape the uneasy feeling that this was a slightly twee version of British history adapted for Americans.
Gleeson did not convince me as Churchill. As another reviewer has noted, he lacked the impish and self-deprecating humour which was such an important counterbalance to some of his less endearing qualities. Janet McTeer's part could have been played by almost anybody. And when did Attlee become a Scot? One of the most convincing bits was the actor they found for Stalin - surely one of the best lookalikes of all time. Otherwise I don't know how they managed to gather such a roster of top acting talent for insignificant roles.
Shame. It could have been good.