It's a criticism that can often be aimed at movies telling intimate stories against a larger historical backdrop that the enormity of wider events gets overshadowed by the central, individual, 'smaller' story on which the film chooses to centre its attention. I think it is very much to the credit of writer Guy Hibbert, and particularly director Amma Asante that in this her third feature she has for me at least managed to sidestep that issue.
I guess that is made somewhat easier by the fact that the story she's choosing to focus on, chronicling the relationship between English clerk Ruth Williams, and Botswana’s king in waiting, Seretse Khama, is not a story set against a story of social upheaval, but is rather the root of, and reason for all the turmoil that lends the movie its weight.
Still, I think it's very much to Asante's credit that she here achieves a wonderful balance between properly fleshing out the two central characters, their personalities, and relationship (thanks in very large part to the fact that she's cast performers as strong as David Oyelowo and Rosamund Pike as much as anything the screenplay is doing) while also managing to fairly comprehensively encompass the scale and seriousness of what is going on around them.
It's the sort of story so vivid, huge, and sort of scary that it defies belief it isn't better known than it is, or that no movie has been made of it to date. Asante's take is hugely watchable, an entertaining, swiftly moving rollercoaster of emotions that is never weighed down by the inarguable heft of proceedings, but never feels like it's treating them lightly. It can't be an easy trick to get right, but get it right she does.
I don't know that I'd call it a perfect movie, I think it could certainly have used a dose of good old fashioned directorly pretension to up its general sense of self importance (the movie is too clean, and to the point. It just tells the story and trusts that’s enough. Is that a criticism? You decide) and I think it does simplify history a little, turn things slightly more black and white than reality may have been (though it's certainly not entirely turned into good vs evil). The movie could have probably been larger, felt even more significant, and complex (yet even still it does attempt to convey the difficulty of the political situation), but this relatively simplified take is as good a movie of its type as I've seen.