Americanized Godzilla ratings (Movie franchise)

Plot of the first movie: When American reporter Steve Martin investigates a series of mysterious disasters off the coast of Japan, he comes face to face with an ancient creature so powerful and so terrifying, it can reduce Tokyo to a smoldering graveyard. Nuclear weapon testing resurrected this relic from the Jurassic age, and now it's rampaging across Japan. At night, Godzilla wades through Tokyo leaving death and destruction in his wake, disappearing into Tokyo Bay when his rage subsides. Coventional weapons are useless against him; but renowned scientist Dr. Serizawa has discovered a weapon that could destroy all life in the bay -- including Godzilla. But which disaster is worse, Godzilla's fury, or the death of Tokyo Bay?