One one hand, if Romney won, perhaps the gazillions of whiners against Obama would shut up for a couple of seconds.
After looking through a couple of comment fields on national newspapers' websites, I've seen Obama being accused of being behind every imaginable evil/nuisance in the world, and the good things he has done is only to mask even worse evils.
Then again, the Obama proponents are still whining about Bush...
On the other hand, from an overseas perspective, letting the Republicans run the US seems almost irresponsible. For four years, we haven't heard anything about what they're for, but loads and loads and loads about what they're against (note: being for evictions, bans or similiar counts as being against the thing you want to evict/ban). It might be my country being very left-centrist, our or newspaper angling it as such, but the Democrats seem like the sensible people here.
I've said it before, I say it again: US politics seems to me like a poop-flinging contest where making sure the other side doesn't run the country is more important than actually running the country.
It's a circus where public popularity/the opponent's lack of it determines the outcome. A political mastermind could be voted down because he did one tiny mistake in his youth (a Republican smoking something illegal, or a Democrat once voting against gun control, or what have you). Tiny cases are blown out of proportions while big problems are only addressed when the opposite side isn't doing a good enough job fixing them.
Whoever wins, it will be exciting. If the Republicans, well, I think the international scene will be shaken up again. If the Democrats, then Obama doesn't have to worry about re-election, and can propose more wacky stuff and push things a little harder than now, as he'll be out of office in four years anyway.
And if a third party... then I'll go out and get some nice photographs of the flying pigs.