We think they missed a trick, however, by not making him a more literal representation of the devastation wreaked on Japan by America. Say, a giant, atomic fire-breathing Guy Fieri, who stomped and spat death on Japanese cities while chanting "U-S-A! U-S-A!".
Fictionally speaking, Godzilla is supposedly a cross between a gorilla and a whale - some sort of giant prehistoric creature, awakened by atomic testing. If you ask us, that sort of mix should result in a peaceful, social, hairy creature, who eats krill... not some giant reptilian thing, who smashes buildings with his big, fat, dinosaur tail.
But perhaps we're overthinking this.