I thought it was great! I've spent a little time in two African countries (east and west) and it took me back to my time in Uganda - especially the schoolchildren singing near the end.
I expected Precious to be only about 5 years older - bearing in mind that Precious was a young divorcee and that Africans typically marry younger than Europeans. Thought Jill Scott was absolutely gorgeous (and hate her for it) and was wonderful as Precious.
Loved David Ayelowo as Kremlin, too - I was writhing off the sofa when he tried to kiss her!
There was an irritating woman reviewing the film on Radio 4's Saturday Review, who said she thought it was 'patronising' that the people were portrayed as so happy and innocent. What does she want from Africa, for goodness' sake? All doom, bloodshed and witchcraft? I must admit I switched off after hearing her whingeing so perhaps she redeemed herself later on. But she sounded like she'd never set foot on African soil - otherwise she might well have encountered many people like those portrayed in the film - I know I have.