XiaNaphryz
LATIN, MATRIPEDICABUS, DO YOU SPEAK IT
Except a bad shot *isn't* just a bad shot. Some things take people out of a movie more than others, and the "thereness" of a character is high on the list. It takes an immense amount of work to make a CG element feel physically present in a way that is obviously inherent to practical effects and puppets. Certainly there are exceptions--E1 Yoda puppet looks terrible and Davey Jones looks absolutely incredible--but the plain fact is that most people's brains are more forgiving of a puppety puppet than a CG character looking "slotted in".
It's been 10 years since the last prequel was in production, there's been a lot of advancements since then. The primary issue with having CG feel part of the scene is lighting, and for the most part the high end CG houses have figured it out enough that a lot of people don't realize something is CG. The first Iron Man was 6 years ago, and even in that film there were scenes where people during production couldn't tell if a shot was using the practical suit footage or the CG model.
Today, it comes down to execution and planning. If they slam ILM with too many shots and not enough time (they have Avengers 2 and other work still to do), then you could very well end up with a bunch of average to sub-standard final shots. All I'm saying is that we're at the point where just because something is CG doesn't automatically mean it'll feel out of place and that it really isn't out of the norm or an exception these days for places like WETA or ILM to get something that looks and feels right.