That stormtrooper looks like he's doing a pirouette. 

Seriously. I tried the Force Unleashed demo and I didn't like it that much.
 
It's like that trend of doctors draping their stethoscopes over their shoulders like a towel instead of having it around the neck in the old utilitarian fashion. It's less efficient and doesn't make much sense, but we think it looks cooler so we do it anyway. But with Starkiller's lightsaber, holding it like that is completely ridiculous and awfully dangerous.
 
Yet I love it, and I hold water bottles, golf clubs, cans of air freshener, and even things that are not cylindrical (books, clothes, etc.) in this manner.