On the topic of why people may not realize that there was so much model work: I was just watching the doc on the ROTS DVD of how they did the Mustafar duel shots. The lava river was a practical miniature, and the shots of the straight miniature look really good. If you compare them to the finished shots, the finished ones have all kinds of color changes and almost an overload of 'stuff' moving throughout the frame. For me personally, there might just be too much going on - even if those added elements are also practical effects (like shots of real lava eruptions at Mt. Etna). The way color is manipulated in films today (compare to the 'teal and orange' trend), plus the way the frame is packed with so much Stuff... I think that may be what people are noticing when they say things like 'too much CGI.' It's not all CGI, but there is an actual issue there, and that's what I think it might be.