You're giant monsters. There's a cardboard city. Wreck it. Rampage is a brilliant game of moving about and dexterity-based skill shots, where when you try to knock down a building you actually drop your little monster and see how many tiny people come tumbling out for you to eat. When you blow down a building, you actually put your chin on your monster and BLOW. When you throw a car, you actually flick it off your monster's head.
It's pretty freaking great, and kids love it.