Romney made a strategic decision not to attack Obama and not allowing Obama to make him sound like a war monger. I think that was a mistake. Romney had an opportunity to nail it and deliver the knockout blow to Obama, but for his own reasons chose not to. I used the word "peace" several times which gives a clue to his strategy.
Everyone knows Obama's foreign policy is in shambles what with the Benghazi disaster and coverup, the Arab Spring turning into a win for Al Qaida and the Muslim Brotherhood, foreign outside Jihadists and tactical weapons flowing into Syria to take over the revolt against Assad with little evidence of the West trying to stop it, yet Romney chose not to bring up any of that. In my opinion, that was a mistake.