I think the trouble with Romney is that his pro-choice, pro-gay rights views of the past aren’t so far in the distant past. Therefore the electorate isn’t quite sure what his core values are and what positions he is likely to advocate and attempt to implement in the near future after his possible election. With Obama, we know and with Ryan, we know; but with Romney, we are left wondering. The only true constant for Romney is his lack of consistency; that is, except for foreign policy, in which he has no past track record to speak of, only his current statements, which, one can only hope, are mere political pandering.
In regard to the war, Obama has at least set a timetable for the withdrawal of troops from Afghanistan, something Romney is opposed to. And with regard to the Iraq War, Obama was one of the few who voted against it, if I remember correctly.