OK, so I just saw the movie for the third time (this time in a DVD Screener) and I just don't understand the hate on the visual effects for the movie.
I know that Gollum is the highlight of the movie in terms of CGI, but I found The Great Goblin to be as an amazing CG character. The facial movement was pure perfection, and all the little details were top class. The character maybe feels fake, because it is a fake creature. Gollum is much more human-like, and thus more belevable. But if TGG was real, I believe that he was going to look like this.
I think the CGI in the movie was in the same class as LOTR, maybe even better.