In a way, I agree with dj juve. If the city's too huge, you don't really get a feel for it, and it doesn't feel like home the same way Vice City did. Most people memorised the whole layout of Vice City, and it was a pleasure to go to familiar areas and know where everything is. I feel that if the city's too huge, it won't feel personal at all, and you'll just feel like you're in a concrete jungle.