I have a strong distaste for WETA's work, and nearly everything they're involved with leaves me more and more disillusioned with the promises of CGI in film. Hate their in work King Kong, hate most of their work in the LOTR series (save for the first, where it's relatively minimal), hate their work in I Robot, Fantastic Four 2, Narnia, and so on.
Although now that I spell it out like that, it could just be that they so often work on such terrible, terrible films.
Avatar is quite a technical accomplishment for them, but the design of the Navi is fucking repugnant, spoiling the entire effort for me.