Please feel free to correct me but the slower you go the closer the shot the more fake it looks - I mean in CGI.
Isn't that why they go so fast?
With a model it doesn't make that much difference but they don't use models any more do they.
No, not really. Used to be like that, for example season 3 of Voyager when they started using CGI a lot more. The quality was noticably lower then in later seasons. But with the quality of CGI these days, you can get very close without losing quality.