I don't think they had the budget to properly do what they wanted. Though, I must admit, I didn't realise it had been filmed in South Africa... Filming in cheap, but inappropriate locations is something that does annoy me... In "Flashbacks of a Fool", South Africa doubled as England and the USA and certainly didn't convince as England... In that case, I think the flashbacks were supposed to have a sort of dreamlike quality. But, still, South Africa does not look like England... And, the example that probably annoys me most these days - "The Musketeers" being filmed in the Czech Republic... Most of the buildings aren't even from the correct era, let alone built in the correct architectural style. But, I've moaned on about that more than enough elsewhere... Happily, there does seem to be a bit of a move away from cheap, foreign locations... For example, the exquisite "Jonathan Strange and Mr Norrell" was sumptuously filmed largely in Yorkshire... Mind you - even when you film in the right country, some people aren't happy... Plenty of people are complaining that Sunday evening's adaptation of "The Go-Between" was filmed in Berkshire rather than Norfolk.
There weren't any scenes set in England. The Rockstar office was in New York.
I wasn't thinking it didn't look like America, the locations seemed passable enough (though I did briefly wonder why they used a Camry as an American police car), I was too busy noticing how clunky the script was. That's what took me out of the story.