As I'm not american and not much in to US interior politics I can only comment on what I know through media etc, as such I haven't voted in the poll. However...
I would say that Kinley3 raises one or two valid points in his earlier posts about gimmicks and such, however pinning America's wars to Obama's lapel is pretty unfair on the guy, yes people can hate about trying to blame things on past administrations, but the guy hasn't started a single war, but has ended one.
On the matter of the healthcare system, and speaking for just about everyone I know in several countries and from several political bents, the fact that until recently America, apparently one of the most advanced civilisations in the world didn't have, and a had large part of the population still thinking of the concept as "commie" somehow, a public healthcare system is insanely laughable!! Obama has faced this issue head on and fought to keep the issue moving even when he faced opposition from his own party, to push through at least a version of such a system.
I'll leave foreign policy as I completely disagree with most of what the US does here, whichever president, only to respond to an earlier posters remark of "responsibility around the world" as total hogwash.
On the issue of economic policy and national debt- Look at the rest of the world! - other countries that were affected by recessions are also still recovering, these things take time, more time than a presidential term. On the down side the US national debt is atrocious, but at least you know about it, in other countries its pretty much swept under the rug until everyone's using leaves as currency. Continuing to put the US in debt to other world powers must really get up economists and business-persons noses, though Im not sure what else could be done. I know in the US like in my country the mere mention of cutting back on spending has absolutely everyone up in arms, as if they dont connect debt with spending....and then object to tax raises!!
I will say that I think I remember one of Obama's election promises was something about the massive income gap (and I could be wrong here) but as far as I can see not much has been done on this front due to big business putting its foot down.
From outside the US it seems that your industries rule the country, not the government.
Kinley3 is right to say the US made itself by following its own ideals and principles, but everything needs moderation, capitalism only works if you have money after all, or to put it another way, there's not point in continuing to dig if the oil has run out.
Another thing I haven't heard much about from the Obama term is any real movement on laws regarding the environment, such as oil or gas drilling regulations etc, which I had hoped would make a comeback to the central stage during his term
All in all I think Obama has been one of the better recent presidents, and that the republican candidates I know of all look like screaming radicalists that cant wait to undo most of what Obama HAS done, invade a new country (for oil/terror/the economy/whatever) and rescind more environmental laws.
Again, these opinions are formed from media and statistics used by comedians
so please do follow this post by telling me what an idiot i apparently am.