This goes back to a point I made in a previous debate. Easy to attack the administration when you know they can't fully respond. Romney can say whatever goofball stuff he wants; Obama has security barriers.
That's kind of the deal when you're the incumbent. His attacks wouldn't bother me as much if there were some thought behind them. He seems to forget that foreign news outlets listen to these debates and that they have the potential to inform foreign policy should he become President.