I was so shocked by the negative reviews of this film on IMDb that I signed up specially to praise it. I'm British, and I absolutely loved all the jokes about my home country, including the music, which is sometimes authentic and sometimes a sort of satire on British patriotic tunes. I don't read strip cartoons, so I don't know how close to the original it is, but it's excellent in its own right. The script is very good - there's all the legionnaires' comments on illegal immigrants (and the satirised illegal immigrant himself is a joy),not to mention Caesar's claptrap about civilising the barbarians. All utterly authentic ... And then there's the dreadful teenager Goudurix, who says everything dreadful British (and I suppose French) teenagers say and do. Does it really matter if he hints Astérix and Obélix might be gay? the film itself makes it clear they aren't, and anyway, gays are good. And there are all the little details, like the 'Godax' - 'Dogax' posters at the rugby match, and the fish and chip shop in Londinium, and the in-jokes about how the British and French see each other. I only gave the film 9 because I personally don't like Depardieu, but he does his job well - oh, and the opening titles are awful and totally unsuited to the film. But in general it's a joy, and it's a real pity most Brits will miss out on it because they wouldn't be able to understand it.
