I would agree that the CGI is WORSE in AotC, but it's shot more realistically.
The GCI in AotC doesn't really look real, but it's generally "filmed" in the space as though it is, which makes it feel - on average - more real than the CGI in RotS, which is really "filmed" as though it's in virtual space - with the camera flying around in crazy, physically impossible ways.

The eye can detect even something like a camera move as unconvincing. The CGI, no matter how real it looks, will look fake if it's presented in a fake way - like with a magically hovering camera.