Del Toro borrows from a variety of sources: Japanese Kaiju films like "Godzilla" (where del Toro gets the name for his monsters); video game simulations (the pilots might as well be operating one, giant real-life dual player video game); and even Michael Bay's "Transformers" film, which lend the jaegers their form. And he treats both his monsters and his robots with a childlike wonder.
"Pacific Rim" is the type of film that will entertain you while you're watching it, but won't have you thinking much about it after. You can give a boy – or in this case, a director – some big, shiny toys to play with. Just don't expect him to leave an impression.