On first glance, it appears Del Toro is attempting to retell two of the best loved movies of the late 20th and early 21st centuries; Michael Bay's metallic toy-fest Transformers, and Godzilla, the only disaster movie that had me cheering on the downfall of man. However, on closer inspection, it looks as though this movie could be a level of mediocrity far greater than the sum of it's constituent parts.
The giant not-Godzilla CGI monsters are aliens who live under the sea (rather like Ursula, from the Little Mermaid) who's sole aim in life is to destroy the cities. Not just mankind, but cities. Smart sea-monsters. And the only way for them to be countered is by blowing them up, much to chagrin of the token bespectacled science guy (I assume Jeff Goldblum was busy). So, in order to blow up the evil beasts, mankind initiates 'Project Jaeger" (presumably with some Jaegerbombs). This, as it almost always inevitably does in Hollywood, manifests itself as two guys in a massive robot costume. They undergo a "mind meld" (a common side effect of Jaegerbombs, incidentally) in order to kick some alien aqua ass.
Then something unexpected happens: a plot twist. Mankind must go back, train to be even better massive metal brawlers (or "2,500 tons of awesome" as Jeff Goldblum Junior suggests) in order to win their survival. The advert implores us to 'Go Big' from July 12 ('Big' what is left ambiguous); before we're told that the apocalypse has been cancelled - which is nothing new as Harold Camping has been cancelling armageddon since May 2011.
But, surely this new film must be decent. I mean, Guillermo Del Toro wouldn't direct a B-movie wannabe with more clichés than a Daily Express story on the EU. Unless he's taking the piss. Or he really wanted to make a big-screen adaptation of the video for Bloc Party's Flux.
Of course, the movie could be really good; and it's just the trailer that's crap.