It's an interesting fact that Guillermo del Toro is most likely considered one of the best directors out there right now, yet he has yet to make a truly big budget film. The Hellboy franchise is probably the closest, but seeing the trailer for Pacific Rim it seems like the money for that was taken from a penny bank.
The robots are huge, the kaiju are even bigger and if nothing else it seems as if del Toro was able to create a truly stylized image of the near future that looks rad. I don't know much about the genre the film is based upon, so coming strictly from a movie lovers point of view, this makes me excited. I also have on good insider info that as much as we see here, there is no way to get a full glimpse at the world in simply a trailer.