Lots of explosions, people running around on fire, a great "oh my eye!" moment and scientists shouting at each other and and getting into fist fights.

I don't know why they didn't shove the manly 70s hair guy into the Japan Trench as it would have stopped all the trouble in the first place. It has to have been his hair that stopped him being killed all those times. His hair was tougher than he was as he couldn't even throw a punch.

Andrew Hughes steals the show as the Australian Prime Minister:
"If we accept 5 million Japanese, they'll simply use our land and resources to build themselves another country."

Australia is the only country in the film not to accept some of the eventual 37 million refugees, they make a point of that for some reason, no idea why...