The ENORMOUS windshield is why. They clear a lot more of the glass this way, and you see a lot more out the front of the car.
Ford Fusion, Focus, Edge and Escape, Chrysler minivans, Honda Civics, and something else I forget at the moment all have em set up like this these days.
It's weird at first, but you get used to it pretty quickly. I like that they leave less uncleared glass at the edge...the best car I've had in this respect was a Saab 900 where the left wiper did a 170-80* sweep (but they were very slow wipers as such)
Many cars before the 70's had wipers like this, don't know why it was changed. If you think about it makes more since. Instead of the passenger one pushing water in your line of site, they push it off to the side.