I was just playing the game on Cadet level (it's late and I wanted something easy to screw around with). This may be the low difficulty level, but civilizations were being destroyed left, right and center! I didn't even have raging barbarians on and every two turns I'd get "The Breen have been destroyed", "The Klingons have been destroyed", "The Hirogen have been destroyed", and on.
Are the barbarians a bit overpowered or is that a result of the Cadet difficulty ?